PHP array one-to-one replacement implementation code

Copy code The code is as follows:
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]).'/');
//There is no matching keyword
if(empty($matches[0])) return false;
//Special replacement settings
$count = count( $matches[0]);
foreach($replace as $key=>$val){
if(!isset($matches[0][$key])) unset($replace[$key]); / /Eliminate out-of-bounds substitutions
}
//Merge the special replacement array and the matching array
for($i=0;$i<$count;$i++){
$matches[0][$i] = isset($replace[ $i])? $replace[$i] : $matches[0][$i];
}
$replace = $matches[0];
//Prevent replacement loops, that is, the replacement character is still the replaced character , at this time, temporarily replace it with a specific character $tmp_match
$replace = implode(',',$replace);
$replace = str_replace($word,$tmp_match,$replace); //Temporarily replace the matching character
$ replace = explode(',',$replace);
//Replacement processing
$string = preg_replace($search,$replace,$string,1); //Only replace one element in the array at a time
$string = str_replace ($tmp_match,$word,$string); //Restore the temporarily replaced matching characters
return $string;
}
//Example 1
$string = 'aaabaaacaaadaaa';
$word = 'aaa';
$replace = array(null,'xxx','yyy');
echo 'Original text:'.$string.'
Output:'.multiple_replace_words($word,$replace,$string).'< br/>
';
//Example 2
$string = 'Chinese aaab Chinese ccaaad Chinese eee';
$word = 'Chinese';
$replace = array(null,'(replace Chinese 2)','(Replace Chinese 3)');
echo 'Original text:'.$string.'
Output:'.multiple_replace_words($word,$replace,$string);
/*
Output result:
Original text: aaabaaacaaadaaa
Output: aaabxxxcyyydaaa
Original text: Chinese aaab Chinese ccaaad Chinese eee
Output: Chinese aaab (replace Chinese 2) ccaaad (replace Chinese 3) eee
//*/