str_ireplace.php.svn-base

来自「PHP 知识管理系统（基于树结构的知识管理系统）, 英文原版的PHP源码。」· SVN-BASE 代码 · 共 113 行

<?php
// +----------------------------------------------------------------------+
// | PHP Version 4                                                        |
// +----------------------------------------------------------------------+
// | Copyright (c) 1997-2004 The PHP Group                                |
// +----------------------------------------------------------------------+
// | This source file is subject to version 3.0 of the PHP license,       |
// | that is bundled with this package in the file LICENSE, and is        |
// | available at through the world-wide-web at                           |
// | http://www.php.net/license/3_0.txt.                                  |
// | If you did not receive a copy of the PHP license and are unable to   |
// | obtain it through the world-wide-web, please send a note to          |
// | [e-mail] so we can mail you a copy immediately.               |
// +----------------------------------------------------------------------+
// | Authors: Aidan Lister <[e-mail]>                                |
// +----------------------------------------------------------------------+
//
// $Id$


/**
 * Replace str_ireplace()
 *
 * @category    PHP
 * @package     PHP_Compat
 * @link        http://php.net/function.str_ireplace
 * @author      Aidan Lister <[e-mail]>
 * @version     $Revision$
 * @since       PHP 5
 * @require     PHP 4.0.0 (user_error)
 * @note        count not by returned by reference, to enable
 *              change '$count = null' to '&$count'
 */
if (!function_exists('str_ireplace')) {
    function str_ireplace($search, $replace, $subject, $count = null)
    {
        // Sanity check
        if (is_string($search) && is_array($replace)) {
            user_error('Array to string conversion', E_USER_NOTICE);
            $replace = (string) $replace;
        }

        // If search isn't an array, make it one
        if (!is_array($search)) {
            $search = array ($search);
        }
        $search = array_values($search);

        // If replace isn't an array, make it one, and pad it to the length of search
        if (!is_array($replace)) {
            $replace_string = $replace;

            $replace = array ();
            for ($i = 0, $c = count($search); $i < $c; $i++) {
                $replace[$i] = $replace_string;
            }
        }
        $replace = array_values($replace);

        // Check the replace array is padded to the correct length
        $length_replace = count($replace);
        $length_search = count($search);
        if ($length_replace < $length_search) {
            for ($i = $length_replace; $i < $length_search; $i++) {
                $replace[$i] = '';
            }
        }

        // If subject is not an array, make it one
        $was_array = false;
        if (!is_array($subject)) {
            $was_array = true;
            $subject = array ($subject);
        }

        // Loop through each subject
        $count = 0;
        foreach ($subject as $subject_key => $subject_value) {
            // Loop through each search
            foreach ($search as $search_key => $search_value) {
                // Split the array into segments, in between each part is our search
                $segments = explode(strtolower($search_value), strtolower($subject_value));

                // The number of replacements done is the number of segments minus the first
                $count += count($segments) - 1;
                $pos = 0;

                // Loop through each segment
                foreach ($segments as $segment_key => $segment_value) {
                    // Replace the lowercase segments with the upper case versions
                    $segments[$segment_key] = substr($subject_value, $pos, strlen($segment_value));
                    // Increase the position relative to the initial string
                    $pos += strlen($segment_value) + strlen($search_value);
                }

                // Put our original string back together
                $subject_value = implode($replace[$search_key], $segments);
            }

            $result[$subject_key] = $subject_value;
        }

        // Check if subject was initially a string and return it as a string
        if ($was_array === true) {
            return $result[0];
        }

        // Otherwise, just return the array
        return $result;
    }
}

?>