How to replace a string with a variable part?

Question

I would like to replace each \x to $matches[x] where x is a number.

It works only for predefined numbers with str_replace:

str_replace( array(
    '\\1',
    '\\2',
    '\\3',
    '\\4'
), array(
    '$matches[1]',
    '$matches[2]',
    '$matches[3]',
    '$matches[4]'
), $string );

Why can't you create the first argument in a dynamic manner, based on the length of the second argument? — arkascha
– arkascha, Commented Nov 25, 2015 at 13:20

Anton Ohorodnyk · Accepted Answer · 2015-11-25 13:22:34Z

1

Use regular expression in preg_replace

Code:

<?php

$str = '\\2 string \\123 gogog \\123 sda \\342 \\3525 wqe \\234';
echo preg_replace('~(\\\\)(\d+)~', '$matches[$2]', $str);

Output:

$matches[2] string $matches[123] gogog $matches[123] sda $matches[342] $matches[3525] wqe $matches[234]

answered Nov 25, 2015 at 13:22

Anton Ohorodnyk

8836 silver badges20 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

How to replace a string with a variable part?

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related