How to use a local variable in preg_replace_callback in PHP.
I have the following code:
function pregRep($matches)
{
global $i; $i++;
if($i > 2)
{
return '#'.$matches[0];
}
else
{
return $matches[0];
}
}
$i = 0;
$str = preg_replace_callback($reg_exp,"pregRep",$str);
And also $str is a string, $reg_exp is a regex expression. Both of these are well defined.
Thanks for your help.
The easiest way is with an anonymous function as callback:
$result = preg_replace_callback(
$pattern,
function ($match) use ($variable) {
// do something
},
$subject
);
Note that you can add multiple variables in this way, but it will create a copy of that variable as it is when the function is defined (this is important if you are assigning it to a variable for multiple uses). If you want a "live" reference to the variable, use &$variable.
Of course, using arrow functions instead requires PHP 7.4 or newer.
globalkeyword is, in general, a code smell.