FloatValidator.php

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<?php
namespace TYPO3\CMS\Extbase\Validation\Validator;

class FloatValidator extends AbstractValidator {

    public function isValid($value) {
        if (is_float($value)) {
            return;
        }

        if (!is_string($value) || strpos($value, '.') === FALSE || preg_match('/^[0-9.e+-]+$/', $value) !== 1) {
            $this->addError(
                $this->translateErrorMessage(
                'validator.float.notvalid',
                'extbase'
                ), 1221560288);
        }
    }
}