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File: classes/library/util.php

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  Classes of Gonzalo Chumillas  >  Ses Query  >  classes/library/util.php  >  Download  
File: classes/library/util.php
Role: Class source
Content type: text/plain
Description: Some util methods
Class: Ses Query
Manipulate records retrieved with select queries
Author: By
Last change:
Date: 2 years ago
Size: 1,829 bytes
 

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<?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;
    }
}