PHP String Helpers

str_combinepath.php

<?php
if (!function_exists('str_combinepath')){
/**
 * Combines two strings into a path.
 * @param string $path1 : The first path to combine.
 * @param string $path2 : The second path to combine.
 * @param string $separator : (Optional) The directory separator. Default: OS specified.
 */
function str_combinepath($path1, $path2, $separator = DIRECTORY_SEPARATOR){
	$path1 = rtrim($path1, $separator);
	$path2 = ltrim($path2, $separator);
	return $path1 . $separator . $path2;
}
}

str_contains, str_icontains.php

<?php
if (!function_exists('str_contains')){
/**
 * Checks if a specified substring occurs within this string.
 * @param string $haystack : The string to test.
 * @param string $needle : The string to seek.
 * @param string $offset : (Optional) Starts searching from specified index.
 */
function str_contains($haystack, $needle, $offset = 0){
	return (bool) strpos($haystack, $needle, $offset);
}

/**
 * Checks if a specified substring occurs within this string. (case insensitive)
 * @param string $haystack : The string to test.
 * @param string $needle : The string to seek.
 * @param string $offset : (Optional) Starts searching from specified index.
 */
function str_icontains($haystack, $needle, $offset = 0){
	return (bool) stripos($haystack, $needle, $offset);
}
}

str_endswith, str_iendswith.php

<?php
if (!function_exists('str_endswith')){
/**
 * Check if a string ends with specified string
 * @param string $haystack : the string to be checked
 * @param string $needle : the string to search
 */
function str_endswith($haystack, $needle) {
    return (strcasecmp(substr($haystack, strlen($haystack) - strlen($needle)), $needle) === 0);
}

/**
 * Check if a string ends with specified string (case insensitive)
 * @param string $haystack : the string to be checked
 * @param string $needle : the string to search
 */
function str_iendswith($haystack, $needle) {
    return (strcmp(substr($haystack, strlen($haystack) - strlen($needle)), $needle) === 0);
}
}

str_isregex.php

<?php
if (!function_exists('str_isregex')){
/**
 * Check if a string given is a valid regex
 * @param string $str : the string to be checked
 */
function str_isregex($str){
	// https://stackoverflow.com/a/10778344/4469947
	return (bool) preg_match("/^\/.+\/[a-z]*$/i", $str);
}
}

str_matchpattern, str_imatchpattern.php

<?php
if (!function_exists('str_matchpattern')){
/**
 * Check if a string given matches a certain pattern
 * @param string $pattern : the reference pattern * -> any, | -> or
 * @param string $str : the string to be checked
 */
function str_matchpattern($pattern, $str) {
	$pattern = preg_replace_callback('/([^*|])/',
		function($m){ return preg_quote("{$m[0]}", "/"); }, $pattern);
	$pattern = str_replace('*', '.*', $pattern);
	return (bool) preg_match('/^' . $pattern . '$/', $str);
}
/**
 * Check if a string given matches a certain pattern (case insensitive)
 * @param string $pattern : the reference pattern * -> any, | -> or
 * @param string $str : the string to be checked
 */
function str_imatchpattern($pattern, $str) {
	$pattern = preg_replace_callback('/([^*|])/',
		function($m){ return preg_quote("{$m[0]}", "/"); }, $pattern);
	$pattern = str_replace('*', '.*', $pattern);
	return (bool) preg_match('/^' . $pattern . '$/i', $str);
}
}

str_startswith, str_istartswith.php

<?php
if (!function_exists('str_startswith')){
/**
 * Check if a string starts with specified string
 * @param string $haystack : the string to be checked
 * @param string $needle : the string to search
 */
function str_startswith($haystack, $needle) {
    return (strcasecmp(substr($haystack, 0, strlen($needle)), $needle) === 0);
}

/**
 * Check if a string starts with specified string (case insensitive)
 * @param string $haystack : the string to be checked
 * @param string $needle : the string to search
 */
function str_istartswith($haystack, $needle) {
    return (strcmp(substr($haystack, 0, strlen($needle)), $needle) === 0);
}
}