Preg_replace问题是剥离数字/字符长度？

Question

Consider the following example....

The issue is with the preg_replace which is used to replace the variables total_balance_overriden and total_balance.

$text = 'this: {{total_balance_overridden}} - that: {{total_balance}}';

$total = '$517.50';
$overiddentotal = '$390.00';

$text = preg_replace('/{{total_balance_overridden}}/', $overiddentotal, $text);
$text = preg_replace('/{{total_balance}}/', $total, $text);


    echo $total;

    echo $overiddentotal;

    echo $text;

This gives me...

$517.50

$390.00

this: 0.00 - that: 7.50

It appears that the $total and $overiddentotal vars have the correct output, but when they have been replaced using the preg_replace, their length has been stripped, and the currency sign and first two numbers are missing. Any ideas why?

Note: If i replace the dollar sign with a pound sign it works! I get...

this: £390.00 - that: £517.50

So is the dollar sign and 2 numbers some sort of special character or var thats getting stripped?

Answer 1

Dollar signs are special characters in replacement strings, they normally refer to captured substrings from the match. If you want a literal dollar sign, you have to escape it:

$total = '\$517.50';
$overiddentotal = '\$390.00';

Note also, in this case, there's no need for regex at all. Just use str_replace() and you won't have this issue.