如何将字符串中的数字数据替换为不同的数字？

There is a string variable containing number data , say $x = "OP/99/DIR"; . The position of the number data may change at any circumstance by user desire by modifying it inside the application , and the slash bar may be changed by any other character ; but the number data is mandatory. How to replace the number data to a different number ? example OP/99/DIR is changed to OP/100/DIR.

$string="OP/99/DIR";
$replace_number=100;
$string = preg_replace('!\d+!', $replace_number, $string);

print $string;

Output:

OP/100/DIR 

Assuming the number only occurs once:

$content = str_replace($originalText, $numberToReplace, $numberToReplaceWith);

To change the first occurance only:

$content = str_replace($originalText, $numberToReplace, $numberToReplaceWith, 1);

Using regex and preg_replace

$x="OP/99/DIR";
$new = 100;
$x=preg_replace('/\d+/e','$new',$x);

print $x;

The most flexible solution is to use preg_replace_callback() so you can do whatever you want with the matches. This matches a single number in the string and then replaces it for the number plus one.

root@xxx:~# more test.php
<?php
function callback($matches) {
  //If there's another match, do something, if invalid
  return $matches[0] + 1;
}

$d[] = "OP/9/DIR";
$d[] = "9\$OP\$DIR";
$d[] = "DIR%OP%9";
$d[] = "OP/9321/DIR";
$d[] = "9321\$OP\$DIR";
$d[] = "DIR%OP%9321";

//Change regexp to use the proper separator if needed
$d2 = preg_replace_callback("(\d+)","callback",$d);

print_r($d2);
?>
root@xxx:~# php test.php
Array
(
    [0] => OP/10/DIR
    [1] => 10$OP$DIR
    [2] => DIR%OP%10
    [3] => OP/9322/DIR
    [4] => 9322$OP$DIR
    [5] => DIR%OP%9322
)