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[2001-01-29 13:00 UTC] gwh at acm dot org
In php_pcre.c line 630, the dollar sign '$' is also used as in indicator for a backreference, which is undocumented. This breaks any replacement string that contains the "$dd" pattern where "dd" are numerical digits. For example:
<?php
$test = "hello there";
$output = preg_replace("/hello/","$10.00",$test);
print $output;
?>
results in the output:
.00 there
The "$10" is taken as a back reference and resolves to NULL leaving the ".00".
In my application, I need to merge user generated text that may contain dollar signs. I am using preg_replace and doing multiple keyword,value substitutions using arrays.
My only workaround right now is to perform a preliminary preg_replace and insert a space after each dollar sign.
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Last updated: Sat Oct 25 05:00:02 2025 UTC |
By the way, no variable replacement is taking place with the "$10.00". It fails if the script is: <?php $test = "hello there"; $output = preg_replace('/hello/','$10.00',$test); print $output; ?> as well. The input that I am passing to the function is posted form data. Which contains valid text up to this function call, afterwhich the replaced text exhibits the problem described above. Thanks...