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Replacement

preg_replace($s1,$s2,$s3[,$i1=-1[,&$i2]]) searches $s3 for matches to the pattern $s1 and replaces them with $s2. $s1,$s2 and $s3 can be strings or arrays of strings. The replacement $s2 may contain references of the form \N or $N, which replaces the text by the n’th parathesized pattern. \0 or $0 refers to the text matched by the whole pattern. $i1 sets the maximum possible replacements. The default is -1(no limit). If specified, $i2 will be filled with the number of replacements done. preg_replace_callback(s1,$f($arr),$s2
[,$i1=-1[,&$i2]]) is similar to preg_replace() except that instead of the replacement string, a callback function should be specified. preg_filter ($s1,$s2,$s3[,$i1=-1[,&$i2]]) is similar to preg_replace() except that it only returns the subjects where there is a match. 

<!DOCTYPE html><html><head></head>
<body><?php

echo preg_replace('/(\w+) (\d+), (\d+)/i','($2 $1 ${3})','January 20, 2000')."<br />";
echo preg_replace(['/is/','/fun/','/learn/','/\s+/'],['is not','easy','master',' '],'PHP is fun to       learn')."<br />";
echo preg_replace(['/is/','/fun/','/learn/'],'***','PHP is fun to learn')."<br />";

?> </body></html>

(20 January 2000)
PHP is not easy to master
PHP *** *** to ***

RESETRUNFULL
<!DOCTYPE html><html><head></head>
<body><?php

function next_year($matches){
  return $matches[1].($matches[2]+1);
}
echo preg_replace_callback(
            "|(\d{2}/\d{2}/)(\d{4})|","next_year","The event will be held on 29/03/2003.");

?> </body></html>

<!DOCTYPE html><html><head></head>
<body><?php

$subject = array('1', 'a', '2', 'b', '3', 'A', 'B', '4'); 
$pattern = array('/\d/', '/[a-z]/', '/[1a]/'); 
$replace = array('A:$0', 'B:$0', 'C:$0'); 
print_r(preg_filter($pattern, $replace, $subject)); 
echo "<br />";
print_r(preg_replace($pattern, $replace, $subject)); 

?> </body></html>

Array ( [0] => A:C:1 [1] => B:C:a [2] => A:2 [3] => B:b [4] => A:3 [7] => A:4 )
Array ( [0] => A:C:1 [1] => B:C:a [2] => A:2 [3] => B:b [4] => A:3 [5] => A [6] => B [7] => A:4 )