2017년 최신 문자열 가로채기 함수 php str_replace의 5가지 사용법과 함수에 대한 자세한 설명

function replace($str)
{
preg_match_all(”/<img(.*)(src=\”[^\"]+\”)[^>]+>/isU”, $str, $arr);
for($i=0,$j=count($arr[0]);$i<$j;$i++){
$str = str_replace($arr[0][$i],”<img alt=\”我的信息” “.$arr[2][$i].” />”,$str);
}
return $str;
}

* string strtr ( string $str , string $from , string $to )
* string strtr ( string $str , array $replace_pairs )

public function str_replace_once($needle,$replace,$haystack) 
{
    $pos = strpos($haystack, $needle);
    if ($pos === false) 
    {
        return $haystack;
    }
 
    return substr_replace($haystack, $replace, $pos, strlen($needle));
}

$str = '正确,联系我们 goodsjob，goodsjob';
$reg = array(',',' ','，' );
$strs = 'username like %'.str_replace($reg,'%, or username like %',$str).'%';

       $str = '正确,联系我们 goodsjob，goodsjob';     
       $str = str_replace(' ', ' ', $str);     
       $reg = array(',','，'," ");     
       $strs = 'username like %'.str_replace($reg,'%, or username like %',$str).'%';

function strtr_array(&$str,&$replace_arr) {
$maxlen = 0;$minlen = 1024*128;
if (empty($replace_arr)) return $str;
foreach($replace_arr as $k => $v) {
$len = strlen($k);
if ($len < 1) continue;
if ($len > $maxlen) $maxlen = $len;
if ($len < $minlen) $minlen = $len;
}
$len = strlen($str);
$pos = 0;$result = &#39;&#39;;
while ($pos < $len) {
if ($pos + $maxlen > $len) $maxlen = $len - $pos;
$found = false;$key = &#39;&#39;;
for($i = 0;$i<$maxlen;++$i) $key .= $str[$i+$pos]; //原文：memcpy(key,str+$pos,$maxlen)
for($i = $maxlen;$i >= $minlen;--$i) {
$key1 = substr($key, 0, $i); //原文：key[$i] = &#39;\0&#39;
if (isset($replace_arr[$key1])) {
$result .= $replace_arr[$key1];
$pos += $i;
$found = true;
break;
}
}
if(!$found) $result .= $str[$pos++];
}
return $result;
}