如何小写字符串 php 中的特定单词

Question

Hye Guys !!

I need your help: Here are 2 elements:

$string = "Legend Of Zelda";
$array = array("to","of","at");

I'd like to check if $string contains one of the $array elements and lowercase it. Tried this, but failed... i got the felling that the first element of the preg_replace should be a pattern or so?

echo preg_replace($array, mb_strtolower($array), $string);

Any idea? Thanks a lot from France !

Answer 1

Use preg_replace_callback :

$string = "Legend Of Zelda";
$array = array("to","of","at");
echo preg_replace_callback('~\b(?:' . implode("|", $array) . ')\b~ui', function ($m) {
    return mb_strtolower($m[0]);
  }, $string);

See PHP demo .

The regex will look like \b(?:to|of|at)\b here, see its demo online .

The /i flag will ensure case insensitive search and /u will handle all Unicode chars correctly.

Answer 2

Maybe this can help you:

$content = "Legend Of Zelda";
$array = array("to","of","at");

foreach($array as $value)
{
    $pattern = '/'.$value.'/i';
    $content = preg_replace($pattern, strtolower($value) , $content);
}


echo $content;