Error trying to pass regex match to function

Question

I\'m getting Syntax error, unexpected T_LNUMBER, expecting T_VARIABLE or \'$\'

This is the code i\'m using

function wpse44503_filter_con         


        

Answer 1

What you're trying to do (ie replacing the matched string with the result of a function call) can't be done using preg_replace, you'll need to use preg_replace_callback instead to get a function called for every match.

A short example of preg_replace_callback;

$get_site_url =                    // Returns replacement
  function($row) { 
    return '!'.$row[1].'!';        // row[1] is first "backref"
  };                                                     

$str = 'olle';
$regex = '/(ll)/';                 // String to match

$output = preg_replace_callback(   // Match, calling get_site_url for replacement
    $regex,
    $get_site_url,
    $str);

var_dump($output);                 // output "o!ll!e"

Answer 2

You can't have '$2' as a variable name. It must start with a letter or underscore.

http://php.net/manual/en/language.variables.basics.php

Variable names follow the same rules as other labels in PHP. A valid variable name starts with a letter or underscore, followed by any number of letters, numbers, or underscores. As a regular expression, it would be expressed thus: '[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*'

Edit Above was my original answer and is the correct answer to the simple "syntax error" question. More in-depth answer below...

You are trying to use $2 to represent "the second capture group", but you haven't done anything at that point to match your regex. Even if $2 was a valid PHP variable name, it still wouldn't be set at that point in your script. Because of this, you can determine that you are using preg_replace improperly and that it may not suit your actual needs.

Note that the preg_replace documentation doesn't support using $n as a separate variable outside of the replacement operation. In other words, 'foo' . $1 . 'bar' is not a valid replacement string, but 'foo$1bar' is.

Depending on the complexity of get_site_url, you have 2 options:

1. If get_site_url is simply adding a root directory or server name, you could change your replacement string to src="/myotherlocation$2". This will effectively replace "/image/..." with "/myotherlocation/image/..." in the img src. This will not work if get_site_url is doing something more complex.

2. If get_site_url is complex, you should use preg_replace_callback per other answers. Give the documentation a read and post a new question (or I guess update this question?) if you have trouble with the implementation.

Answer 3

PHP variable names cant begin with a number.

Answer 4

$2 is not a valid PHP variable. If you meant the second group in the regex then you want to put \2 in a string. However, since you're passing it to a function then you'll need to use preg_replace_callback() instead and substitute appropriately in the callback.

Answer 5

if PHP variable begins with number use following:

when I was getting the following as the result set from thrid party API

Code Works

$stockInfo->original->data[0]->close_yesterday

Code Failed

$stockInfo->original->data[0]->52_week_low

Solution

$stockInfo->original->data[0]->{'52_week_high'}