php array one to one substitution implementation code

 
<?php 
header("Content-type: text/html; charset=utf-8"); 
function multiple_replace_words($word,$replace,$string,$tmp_match='#a_a#'){ 
preg_match_all('/'.$word.'/',$string,$matches); // Match all keywords  
$search = explode(',','/'.implode('/,/',$matches[0]).'/'); 
// No matching keywords exist  
if(empty($matches[0])) return false; 
// Special substitution Settings  
$count = count($matches[0]); 
foreach($replace as $key=>$val){ 
if(!isset($matches[0][$key])) unset($replace[$key]); // Eliminate out of bounds substitutions  
} 
// Merges a special substitution array with a matching array  
for($i=0;$i<$count;$i++){ 
$matches[0][$i] = isset($replace[$i])? $replace[$i] : $matches[0][$i]; 
} 
$replace = $matches[0]; 
// To prevent a replacement loop, where the replacement character is still the replaced character, temporarily replace it 1 Particular characters $tmp_match 
$replace = implode(',',$replace); 
$replace = str_replace($word,$tmp_match,$replace); // Temporary replacement of matching characters  
$replace = explode(',',$replace); 
// Replace the processing  
$string = preg_replace($search,$replace,$string,1); // You just replace the array at a time 1 a  
$string = str_replace($tmp_match,$word,$string); // Restores the matching character of the temporary replacement  
return $string; 
} 
// The sample 1 
$string = 'aaabaaacaaadaaa'; 
$word = 'aaa'; 
$replace = array(null,'xxx','yyy'); 
echo ' The original: '.$string.'<br/> Output: '.multiple_replace_words($word,$replace,$string).'<br/><br/>'; 
// The sample 2 
$string = ' Chinese aaab Chinese ccaaad Chinese eee'; 
$word = ' Chinese '; 
$replace = array(null,' (substitute Chinese 2 ) ',' (substitute Chinese 3 ) '); 
echo ' The original: '.$string.'<br/> Output: '.multiple_replace_words($word,$replace,$string); 
/* 
 Output results:  
 The original: aaabaaacaaadaaa 
 Output: aaabxxxcyyydaaa 
 Original text: Chinese aaab Chinese ccaaad Chinese eee 
 Output: Chinese aaab (substitute Chinese 2 ) ccaaad (substitute Chinese 3 ) eee 
//*/