<?php
/**
* This file contains the util class.
*
* @author Gonzalo Chumillas <gonzalo@soloproyectos.com>
* @package library
*/
/**
* class util
*
* This class contains several useful static functions.
*
* @package library
*/
class util {
/**
* Checks whether a value is an empty string or a null value.
*
* Example:
* <pre>
* util::isempty(''); // returns TRUE, as '' is an empty string
* util::isempty(null); // returns TRUE, as the value is null
* util::isempty('testing'); // returns FALSE, as 'testing' is not an empty string
* util::isempty(0); // returns FALSE, as 0 is not a string
* </pre>
*
* @param string $str
* @return boolean
*/
public static function isEmpty($str) {
return $str === NULL || is_string($str) && strlen($str) == 0;
}
/**
* Concatenates multiple strings using the 'glue' parameter.
* This function ignores the undefined and empty strings.
*
* Examples:
*
* util::concat(', ', 'John', '', 'Maria', null, 'Mohamad'); // returns 'John, Maria, Mohamad'
* util::concat(', ', 'John'); // returns 'John'
*
* @param string url
* @param string str...
* @return string
*/
public static function concat($glue) {
$ret = "";
$args = func_get_args();
$len = func_num_args();
for ($i = 1; $i < $len; $i++) {
$str = func_get_arg($i);
if (util::isempty($str)) {
continue;
}
if (strlen($ret) > 0) {
$ret = rtrim($ret, $glue) . $glue;
}
$ret .= $str;
}
return $ret;
}
}
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