JString.php

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<?php
namespace Ajax\service;

class JString {

    public static function contains($hay, $needle) {
        return strpos($hay, "$needle") !== false;
    }

    public static function startswith($hay, $needle) {
        return substr($hay, 0, strlen($needle)) === $needle;
    }

    public static function endswith($hay, $needle) {
        return substr($hay, - strlen($needle)) === $needle;
    }

    public static function isNull($s) {
        return (! isset($s) || NULL === $s || "" === $s);
    }

    public static function isNotNull($s) {
        return (isset($s) && NULL !== $s && "" !== $s);
    }

    public static function isBoolean($value) {
        return \is_bool($value) || $value == 1 || $value == 0;
    }

    public static function isBooleanTrue($value) {
        return $value == 1 || $value;
    }

    public static function isBooleanFalse($value) {
        return $value == 0 || ! $value;
    }

    public static function camelCaseToSeparated($input, $separator = " ") {
        return strtolower(preg_replace('/(?<!^)[A-Z]/', $separator . '$0', $input));
    }

    public static function replaceAtFirst($subject, $from, $to) {
        $from = '/\A' . preg_quote($from, '/') . '/';
        return \preg_replace($from, $to, $subject, 1);
    }

    public static function replaceAtLast($subject, $from, $to) {
        $from = '/' . preg_quote($from, '/') . '\z/';
        return \preg_replace($from, $to, $subject, 1);
    }

    public static function replaceAtFirstAndLast($subject, $fromFirst, $toFirst, $fromLast, $toLast) {
        $s = self::replaceAtFirst($subject, $fromFirst, $toFirst);
        return self::replaceAtLast($s, $fromLast, $toLast);
    }

    public static function getValueBetween(&$str, $before = "{{", $after = "}}") {
        $matches = [];
        $result = null;
        $_before = \preg_quote($before);
        $_after = \preg_quote($after);
        if (\preg_match('/' . $_before . '(.*?)' . $_after . '/s', $str, $matches) === 1) {
            $result = $matches[1];
            $str = \str_replace($before . $result . $after, "", $str);
        }
        return $result;
    }

    public static function doubleBackSlashes($value) {
        if (\is_string($value))
            return \str_replace("\\", "\\\\", $value);
        return $value;
    }

    public static function cleanIdentifier($id) {
        return \preg_replace('/[^a-zA-Z0-9\-\_]/s', '', $id);
    }
}