Indexer

Indexing class for TYPO3 frontend

Internal

Table of Contents

Properties

$conf  : array<string|int, mixed>
$content_md5h  : int
Content of TYPO3 page
$contentParts  : array<string|int, mixed>
Hash array for files
$defaultContentArray  : array<string|int, mixed>
Set when crawler is detected (internal)
$defaultGrList  : string
External parser objects, keys are file extension names. Values are objects with certain methods.
$enableMetaphoneSearch  : bool
$excludeSections  : string
HTML code blocks to exclude from indexing
$external_parsers  : array<string|int, mixed>
Supported Extensions for external files
$externalFileCounter  : int
$file_phash_arr  : array<string|int, mixed>
Hash array, contains phash and phash_grouping
$flagBitMask  : int
$forceIndexing  : bool
Max number of external files to index.
$freqMax  : float
$freqRange  : int
$hash  : array<string|int, mixed>
Indexer configuration, coming from TYPO3's system configuration for EXT:indexed_search
$indexerConfig  : array<string|int, mixed>
Configuration set internally (see init functions for required keys and their meaning)
$indexExternalUrl_content  : string
Internal log
$internal_log  : array<string|int, mixed>
$lexerObj  : Lexer
Lexer object for word splitting
$maxExternalFiles  : int
If set, this tells a minimum limit before a document can be indexed again. This is regardless of mtime.
$metaphoneContent  : string
$metaphoneObj  : DoubleMetaPhoneUtility|null
Metaphone object, if any
$reasons  : array<string|int, mixed>
$storeMetaphoneInfoAsWords  : bool
$tstamp_maxAge  : int
Min/Max times
$tstamp_minAge  : int
If set, this tells a number of seconds that is the maximum age of an indexed document.
$wordcount  : int
$timeTracker  : TimeTracker

Methods

__construct()  : mixed
Indexer constructor.
analyzeBody()  : mixed
Calculates relevant information for bodycontent
analyzeHeaderinfo()  : mixed
Calculates relevant information for headercontent
bodyDescription()  : string
Extracts the sample description text from the content array.
charsetEntity2utf8()  : mixed
Convert character set and HTML entities in the value of input content array keys
checkContentHash()  : mixed
Check content hash in phash table
checkExternalDocContentHash()  : bool
Check content hash for external documents Returns TRUE if the document needs to be indexed (that is, there was no result)
checkMtimeTstamp()  : int
Check the mtime / tstamp of the currently indexed page/file (based on phash) Return positive integer if the page needs to be indexed
checkWordList()  : mixed
Adds new words to db
convertHTMLToUtf8()  : string
Converts a HTML document to utf-8
embracingTags()  : bool
Finds first occurrence of embracing tags and returns the embraced content and the original string with the tag removed in the two passed variables. Returns FALSE if no match found. ie. useful for finding <title> of document or removing <script>-sections
extractBaseHref()  : string
Extracts the "base href" from content string.
extractHyperLinks()  : array<string|int, mixed>
Extracts all links to external documents from the HTML content string
extractLinks()  : mixed
Extract links (hrefs) from HTML content and if indexable media is found, it is indexed.
fileContentParts()  : array<string|int, mixed>
Creates an array with pointers to divisions of document.
freqMap()  : int
maps frequency from a real number in [0;1] to an integer in [0;$this->freqRange] with anything above $this->freqMax as 1 and back.
getHTMLcharset()  : string
Extract the charset value from HTML meta tag.
getRootLineFields()  : mixed
Adding values for root-line fields.
getUrlHeaders()  : mixed
Getting HTTP request headers of URL
indexAnalyze()  : array<string|int, mixed>
Analyzes content to use for indexing,
indexExternalUrl()  : mixed
Index External URLs HTML content
indexRegularDocument()  : mixed
Indexing a regular document given as $file (relative to public web path, local file)
indexTypo3PageContent()  : mixed
Start indexing of the TYPO3 page
init()  : mixed
Initializes the object.
initializeExternalParsers()  : mixed
Initialize external parsers
is_grlist_set()  : bool
Checks if a grlist record has been set for the phash value input (looking at the "real" phash of the current content, not the linked-to phash of the common search result page)
log_pull()  : mixed
Pull function wrapper for TT logging
log_push()  : mixed
Push function wrapper for TT logging
log_setTSlogMessage()  : void
metaphone()  : mixed
Creating metaphone based hash from input word
processWordsInArrays()  : array<string|int, mixed>
Processing words in the array from split*Content -functions
readFileContent()  : array<string|int, mixed>|null
Reads the content of an external file being indexed.
removeOldIndexedFiles()  : mixed
Removes records for the indexed page, $phash
removeOldIndexedPages()  : mixed
Removes records for the indexed page, $phash
setExtHashes()  : array<string|int, mixed>
Get search hash, external files
setT3Hashes()  : mixed
Get search hash, T3 pages
splitHTMLContent()  : array<string|int, mixed>
Splits HTML content and returns an associative array, with title, a list of metatags, and a list of words in the body.
splitRegularContent()  : array<string|int, mixed>
Splits non-HTML content (from external files for instance)
submit_grlist()  : mixed
Stores gr_list in the database.
submit_section()  : mixed
Stores section $hash and $hash_t3 are the same for TYPO3 pages, but different when it is external files.
submitFile_grlist()  : mixed
Stores file gr_list for a file IF it does not exist already
submitFile_section()  : mixed
Stores file section for a file IF it does not exist
submitFilePage()  : mixed
Updates db with information about the file
submitPage()  : mixed
Updates db with information about the page (TYPO3 page, not external media)
submitWords()  : mixed
Submits RELATIONS between words and phash
typoSearchTags()  : bool
Removes content that shouldn't be indexed according to TYPO3SEARCH-tags.
update_grlist()  : mixed
Check if a grlist-entry for this hash exists and if not so, write one.
updateParsetime()  : mixed
Update parsetime for phash row.
updateRootline()  : mixed
Update section rootline for the page
updateSetId()  : mixed
Update SetID of the index_phash record.
updateTstamp()  : mixed
Update tstamp for a phash row.
addSpacesToKeywordList()  : string
Makes sure that keywords are space-separated. This is important for their proper displaying as a part of fulltext index.
createLocalPath()  : string
Checks if the file is local
createLocalPathFromAbsoluteURL()  : string
Attempts to create a local file path from the absolute URL without schema.
createLocalPathFromRelativeURL()  : string
Attempts to create a local file path from the relative URL.
createLocalPathUsingAbsRefPrefix()  : string
Attempts to create a local file path by matching absRefPrefix. This requires TSFE. If TSFE is missing, this function does nothing.
createLocalPathUsingDomainURL()  : string
Attempts to create a local file path by matching a current request URL.
isAllowedLocalFile()  : bool
Checks if the path points to the file inside the web site
isRelativeURL()  : bool
Checks if URL is relative.

Properties

$conf

public array<string|int, mixed> $conf = []

$content_md5h

Content of TYPO3 page

public int $content_md5h

$contentParts

Hash array for files

public array<string|int, mixed> $contentParts = []

$defaultContentArray

Set when crawler is detected (internal)

public array<string|int, mixed> $defaultContentArray = ['title' => '', 'description' => '', 'keywords' => '', 'body' => '']

$defaultGrList

External parser objects, keys are file extension names. Values are objects with certain methods.

public string $defaultGrList = '0,-1'

Fe-group list (pages might be indexed separately for each usergroup combination to support search in access limited pages!)

$enableMetaphoneSearch

public bool $enableMetaphoneSearch = false

$excludeSections

HTML code blocks to exclude from indexing

public string $excludeSections = 'script,style'

$external_parsers

Supported Extensions for external files

public array<string|int, mixed> $external_parsers = []

$externalFileCounter

public int $externalFileCounter = 0

$file_phash_arr

Hash array, contains phash and phash_grouping

public array<string|int, mixed> $file_phash_arr = []

$forceIndexing

Max number of external files to index.

public bool $forceIndexing = false

$hash

Indexer configuration, coming from TYPO3's system configuration for EXT:indexed_search

public array<string|int, mixed> $hash = []

$indexerConfig

Configuration set internally (see init functions for required keys and their meaning)

public array<string|int, mixed> $indexerConfig = []

$indexExternalUrl_content

Internal log

public string $indexExternalUrl_content = ''

$internal_log

public array<string|int, mixed> $internal_log = []

$maxExternalFiles

If set, this tells a minimum limit before a document can be indexed again. This is regardless of mtime.

public int $maxExternalFiles = 0

$metaphoneContent

public string $metaphoneContent = ''

$reasons

public array<string|int, mixed> $reasons = [-1 => 'mtime matched the document, so no changes detected and no content updated', -2 => 'The minimum age was not exceeded', 1 => 'The configured max-age was exceeded for the document and thus it\'s indexed.', 2 => 'The minimum age was exceed and mtime was set and the mtime was different, so the page was indexed.', 3 => 'The minimum age was exceed, but mtime was not set, so the page was indexed.', 4 => 'Page has never been indexed (is not represented in the index_phash table).']

$storeMetaphoneInfoAsWords

public bool $storeMetaphoneInfoAsWords

$tstamp_maxAge

Min/Max times

public int $tstamp_maxAge = 0

$tstamp_minAge

If set, this tells a number of seconds that is the maximum age of an indexed document.

public int $tstamp_minAge = 0

Regardless of mtime the document will be re-indexed if this limit is exceeded.

Methods

__construct()

Indexer constructor.

public __construct() : mixed

analyzeBody()

Calculates relevant information for bodycontent

public analyzeBody(array<string|int, mixed> &$retArr, array<string|int, mixed> $content) : mixed
Parameters
$retArr : array<string|int, mixed>

Index array, passed by reference

$content : array<string|int, mixed>

Standard content array

analyzeHeaderinfo()

Calculates relevant information for headercontent

public analyzeHeaderinfo(array<string|int, mixed> &$retArr, array<string|int, mixed> $content, string $key, int $offset) : mixed
Parameters
$retArr : array<string|int, mixed>

Index array, passed by reference

$content : array<string|int, mixed>

Standard content array

$key : string

Key from standard content array

$offset : int

Bit-wise priority to type

bodyDescription()

Extracts the sample description text from the content array.

public bodyDescription(array<string|int, mixed> $contentArr) : string
Parameters
$contentArr : array<string|int, mixed>

Content array

Return values
string

Description string

charsetEntity2utf8()

Convert character set and HTML entities in the value of input content array keys

public charsetEntity2utf8(array<string|int, mixed> &$contentArr) : mixed
Parameters
$contentArr : array<string|int, mixed>

Standard content array

checkContentHash()

Check content hash in phash table

public checkContentHash() : mixed
Return values
mixed

Returns TRUE if the page needs to be indexed (that is, there was no result), otherwise the phash value (in an array) of the phash record to which the grlist_record should be related!

checkExternalDocContentHash()

Check content hash for external documents Returns TRUE if the document needs to be indexed (that is, there was no result)

public checkExternalDocContentHash(int $hashGr, int $content_md5h) : bool
Parameters
$hashGr : int

phash value to check (phash_grouping)

$content_md5h : int

Content hash to check

Return values
bool

Returns TRUE if the document needs to be indexed (that is, there was no result)

checkMtimeTstamp()

Check the mtime / tstamp of the currently indexed page/file (based on phash) Return positive integer if the page needs to be indexed

public checkMtimeTstamp(int $mtime, int $phash) : int
Parameters
$mtime : int

mtime value to test against limits and indexed page (usually this is the mtime of the cached document)

$phash : int

"phash" used to select any already indexed page to see what its mtime is.

Return values
int

Result integer: Generally: <0 = No indexing, >0 = Do indexing (see $this->reasons): -2) Min age was NOT exceeded and so indexing cannot occur. -1) mtime matched so no need to reindex page. 0) N/A 1) Max age exceeded, page must be indexed again. 2) mtime of indexed page doesn't match mtime given for current content and we must index page. 3) No mtime was set, so we will index... 4) No indexed page found, so of course we will index.

checkWordList()

Adds new words to db

public checkWordList(array<string|int, mixed> $wordListArray) : mixed
Parameters
$wordListArray : array<string|int, mixed>

Word List array (where each word has information about position etc).

convertHTMLToUtf8()

Converts a HTML document to utf-8

public convertHTMLToUtf8(string $content[, string $charset = '' ]) : string
Parameters
$content : string

HTML content, any charset

$charset : string = ''

Optional charset (otherwise extracted from HTML)

Return values
string

Converted HTML

embracingTags()

Finds first occurrence of embracing tags and returns the embraced content and the original string with the tag removed in the two passed variables. Returns FALSE if no match found. ie. useful for finding <title> of document or removing <script>-sections

public embracingTags(string $string, string $tagName, string &$tagContent, string &$stringAfter, string &$paramList) : bool
Parameters
$string : string

String to search in

$tagName : string

Tag name, eg. "script

$tagContent : string

Passed by reference: Content inside found tag

$stringAfter : string

Passed by reference: Content after found tag

$paramList : string

Passed by reference: Attributes of the found tag.

Return values
bool

Returns FALSE if tag was not found, otherwise TRUE.

extractBaseHref()

Extracts the "base href" from content string.

public extractBaseHref(string $html) : string
Parameters
$html : string

Content to analyze

Return values
string

The base href or an empty string if not found

Extracts all links to external documents from the HTML content string

public extractHyperLinks(string $html) : array<string|int, mixed>
Parameters
$html : string
Tags
see
extractLinks()
Return values
array<string|int, mixed>

Array of hyperlinks (keys: tag, href, localPath (empty if not local))

Extract links (hrefs) from HTML content and if indexable media is found, it is indexed.

public extractLinks(string $content) : mixed
Parameters
$content : string

HTML content

fileContentParts()

Creates an array with pointers to divisions of document.

public fileContentParts(string $ext, string $absFile) : array<string|int, mixed>
Parameters
$ext : string

File extension

$absFile : string

Absolute filename (must exist and be validated OK before calling function)

Return values
array<string|int, mixed>

Array of pointers to sections that the document should be divided into

freqMap()

maps frequency from a real number in [0;1] to an integer in [0;$this->freqRange] with anything above $this->freqMax as 1 and back.

public freqMap(float $freq) : int
Parameters
$freq : float

Frequency

Return values
int

Frequency in range.

getHTMLcharset()

Extract the charset value from HTML meta tag.

public getHTMLcharset(string $content) : string
Parameters
$content : string

HTML content

Return values
string

The charset value if found.

getRootLineFields()

Adding values for root-line fields.

public getRootLineFields(array<string|int, mixed> &$fieldArray) : mixed

rl0, rl1 and rl2 are standard. A hook might add more.

Parameters
$fieldArray : array<string|int, mixed>

Field array, passed by reference

getUrlHeaders()

Getting HTTP request headers of URL

public getUrlHeaders(string $url) : mixed
Parameters
$url : string

The URL

Return values
mixed

If no answer, returns FALSE. Otherwise an array where HTTP headers are keys

indexAnalyze()

Analyzes content to use for indexing,

public indexAnalyze(array<string|int, mixed> $content) : array<string|int, mixed>
Parameters
$content : array<string|int, mixed>

Standard content array: an array with the keys title,keywords,description and body, which all contain an array of words.

Return values
array<string|int, mixed>

Index Array (whatever that is...)

indexExternalUrl()

Index External URLs HTML content

public indexExternalUrl(string $externalUrl) : mixed
Parameters
$externalUrl : string

URL, eg. "https://typo3.org/

Tags
see
indexRegularDocument()

indexRegularDocument()

Indexing a regular document given as $file (relative to public web path, local file)

public indexRegularDocument(string $file[, bool $force = false ][, string $contentTmpFile = '' ][, string $altExtension = '' ]) : mixed
Parameters
$file : string

Relative Filename, relative to public web path. It can also be an absolute path as long as it is inside the lockRootPath. Finally, if $contentTmpFile is set, this value can be anything, most likely a URL

$force : bool = false

If set, indexing is forced (despite content hashes, mtime etc).

$contentTmpFile : string = ''

Temporary file with the content to read it from (instead of $file). Used when the $file is a URL.

$altExtension : string = ''

File extension for temporary file.

indexTypo3PageContent()

Start indexing of the TYPO3 page

public indexTypo3PageContent() : mixed

init()

Initializes the object.

public init([array<string|int, mixed>|null $configuration = null ]) : mixed
Parameters
$configuration : array<string|int, mixed>|null = null

will be used to set $this->conf, otherwise $this->conf MUST be set with proper values prior to this call

initializeExternalParsers()

Initialize external parsers

public initializeExternalParsers() : mixed
Internal
Tags
see
init()

is_grlist_set()

Checks if a grlist record has been set for the phash value input (looking at the "real" phash of the current content, not the linked-to phash of the common search result page)

public is_grlist_set(int $phash_x) : bool
Parameters
$phash_x : int

Phash integer to test.

Return values
bool

log_pull()

Pull function wrapper for TT logging

public log_pull() : mixed

log_push()

Push function wrapper for TT logging

public log_push(string $msg, string $key) : mixed
Parameters
$msg : string

Title to set

$key : string

Key (?)

log_setTSlogMessage()

public log_setTSlogMessage(string $msg[, string $logLevel = LogLevel::INFO ]) : void
Parameters
$msg : string
$logLevel : string = LogLevel::INFO

metaphone()

Creating metaphone based hash from input word

public metaphone(string $word[, bool $returnRawMetaphoneValue = false ]) : mixed
Parameters
$word : string

Word to convert

$returnRawMetaphoneValue : bool = false

If set, returns the raw metaphone value (not hashed)

Return values
mixed

Metaphone hash integer (or raw value, string)

processWordsInArrays()

Processing words in the array from split*Content -functions

public processWordsInArrays(array<string|int, mixed> $contentArr) : array<string|int, mixed>
Parameters
$contentArr : array<string|int, mixed>

Array of content to index, see splitHTMLContent() and splitRegularContent()

Return values
array<string|int, mixed>

Content input array modified so each key is not a unique array of words

readFileContent()

Reads the content of an external file being indexed.

public readFileContent(string $fileExtension, string $absoluteFileName, string $sectionPointer) : array<string|int, mixed>|null

The content from the external parser MUST be returned in utf-8!

Parameters
$fileExtension : string

File extension, eg. "pdf", "doc" etc.

$absoluteFileName : string

Absolute filename of file (must exist and be validated OK before calling function)

$sectionPointer : string

Pointer to section (zero for all other than PDF which will have an indication of pages into which the document should be splitted.)

Return values
array<string|int, mixed>|null

Standard content array (title, description, keywords, body keys)

removeOldIndexedFiles()

Removes records for the indexed page, $phash

public removeOldIndexedFiles(int $phash) : mixed
Parameters
$phash : int

phash value to flush

removeOldIndexedPages()

Removes records for the indexed page, $phash

public removeOldIndexedPages(int $phash) : mixed
Parameters
$phash : int

phash value to flush

setExtHashes()

Get search hash, external files

public setExtHashes(string $file[, array<string|int, mixed> $subinfo = [] ]) : array<string|int, mixed>
Parameters
$file : string

File name / path which identifies it on the server

$subinfo : array<string|int, mixed> = []

Additional content identifying the (subpart of) content. For instance; PDF files are divided into groups of pages for indexing.

Return values
array<string|int, mixed>

Array with "phash_grouping" and "phash" inside.

setT3Hashes()

Get search hash, T3 pages

public setT3Hashes() : mixed

splitHTMLContent()

Splits HTML content and returns an associative array, with title, a list of metatags, and a list of words in the body.

public splitHTMLContent(string $content) : array<string|int, mixed>
Parameters
$content : string

HTML content to index. To some degree expected to be made by TYPO3 (ei. splitting the header by ":")

Tags
see
splitRegularContent()
Return values
array<string|int, mixed>

Array of content, having keys "title", "body", "keywords" and "description" set.

splitRegularContent()

Splits non-HTML content (from external files for instance)

public splitRegularContent(string $content) : array<string|int, mixed>
Parameters
$content : string

Input content (non-HTML) to index.

Tags
see
splitHTMLContent()
Return values
array<string|int, mixed>

Array of content, having the key "body" set (plus "title", "description" and "keywords", but empty)

submit_grlist()

Stores gr_list in the database.

public submit_grlist(int $hash, int $phash_x) : mixed
Parameters
$hash : int

Search result record phash

$phash_x : int

Actual phash of current content

Tags
see
update_grlist()

submit_section()

Stores section $hash and $hash_t3 are the same for TYPO3 pages, but different when it is external files.

public submit_section(int $hash, int $hash_t3) : mixed
Parameters
$hash : int

phash of TYPO3 parent search result record

$hash_t3 : int

phash of the file indexation search record

submitFile_grlist()

Stores file gr_list for a file IF it does not exist already

public submitFile_grlist(int $hash) : mixed
Parameters
$hash : int

phash value of file

submitFile_section()

Stores file section for a file IF it does not exist

public submitFile_section(int $hash) : mixed
Parameters
$hash : int

phash value of file

submitFilePage()

Updates db with information about the file

public submitFilePage(array<string|int, mixed> $hash, string $file, array<string|int, mixed> $subinfo, string $ext, int $mtime, int $ctime, int $size, int $content_md5h, array<string|int, mixed> $contentParts) : mixed
Parameters
$hash : array<string|int, mixed>

Array with phash and phash_grouping keys for file

$file : string

File name

$subinfo : array<string|int, mixed>

Array of "static_page_arguments" for files: This is for instance the page index for a PDF file (other document types it will be a zero)

$ext : string

File extension determining the type of media.

$mtime : int

Modification time of file.

$ctime : int

Creation time of file.

$size : int

Size of file in bytes

$content_md5h : int

Content HASH value.

$contentParts : array<string|int, mixed>

Standard content array (using only title and body for a file)

submitPage()

Updates db with information about the page (TYPO3 page, not external media)

public submitPage() : mixed

submitWords()

Submits RELATIONS between words and phash

public submitWords(array<string|int, mixed> $wordList, int $phash) : mixed
Parameters
$wordList : array<string|int, mixed>

Word list array

$phash : int

phash value

typoSearchTags()

Removes content that shouldn't be indexed according to TYPO3SEARCH-tags.

public typoSearchTags(string &$body) : bool
Parameters
$body : string

HTML Content, passed by reference

Return values
bool

Returns TRUE if a TYPOSEARCH_ tag was found, otherwise FALSE.

update_grlist()

Check if a grlist-entry for this hash exists and if not so, write one.

public update_grlist(int $phash, int $phash_x) : mixed
Parameters
$phash : int

phash of the search result that should be found

$phash_x : int

The real phash of the current content. The two values are different when a page with userlogin turns out to contain the exact same content as another already indexed version of the page; This is the whole reason for the grlist table in fact...

Tags
see
submit_grlist()

updateParsetime()

Update parsetime for phash row.

public updateParsetime(int $phash, int $parsetime) : mixed
Parameters
$phash : int

phash value.

$parsetime : int

Parsetime value to set.

updateRootline()

Update section rootline for the page

public updateRootline() : mixed

updateSetId()

Update SetID of the index_phash record.

public updateSetId(int $phash) : mixed
Parameters
$phash : int

phash value

updateTstamp()

Update tstamp for a phash row.

public updateTstamp(int $phash[, int $mtime = 0 ]) : mixed
Parameters
$phash : int

phash value

$mtime : int = 0

If set, update the mtime field to this value.

addSpacesToKeywordList()

Makes sure that keywords are space-separated. This is important for their proper displaying as a part of fulltext index.

protected addSpacesToKeywordList(string $keywordList) : string
Parameters
$keywordList : string
Tags
see
https://forge.typo3.org/issues/14959
Return values
string

createLocalPath()

Checks if the file is local

protected createLocalPath(string $sourcePath) : string
Parameters
$sourcePath : string
Return values
string

Absolute path to file if file is local, else empty string

createLocalPathFromAbsoluteURL()

Attempts to create a local file path from the absolute URL without schema.

protected createLocalPathFromAbsoluteURL(string $sourcePath) : string
Parameters
$sourcePath : string
Return values
string

createLocalPathFromRelativeURL()

Attempts to create a local file path from the relative URL.

protected createLocalPathFromRelativeURL(string $sourcePath) : string
Parameters
$sourcePath : string
Return values
string

createLocalPathUsingAbsRefPrefix()

Attempts to create a local file path by matching absRefPrefix. This requires TSFE. If TSFE is missing, this function does nothing.

protected createLocalPathUsingAbsRefPrefix(string $sourcePath) : string
Parameters
$sourcePath : string
Return values
string

createLocalPathUsingDomainURL()

Attempts to create a local file path by matching a current request URL.

protected createLocalPathUsingDomainURL(string $sourcePath) : string
Parameters
$sourcePath : string
Return values
string

isAllowedLocalFile()

Checks if the path points to the file inside the web site

protected static isAllowedLocalFile(string $filePath) : bool
Parameters
$filePath : string
Return values
bool

isRelativeURL()

Checks if URL is relative.

protected static isRelativeURL(string $url) : bool
Parameters
$url : string
Return values
bool

        
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