PHP的str_replace替代品

Question

In the str_replace manual for PHP it states the following:

Because str_replace() replaces left to right, it might replace a previously inserted value when doing multiple replacements. See also the examples in this document.

Is there an equivalent function that does not have this gotcha or how can I safely do this?

Answer 1

You're looking for strtr ( string $str , array $replace_pairs ).

If given two arguments, the second should be an array in the form array('from' => 'to', ...). The return value is a string where all the occurrences of the array keys have been replaced by the corresponding values. The longest keys will be tried first. Once a substring has been replaced, its new value will not be searched again.

Example from the manual:

<?php
$trans = array("h" => "-", "hello" => "hi", "hi" => "hello");
echo strtr("hi all, I said hello", $trans);
?>

Will output:

hello all, I said hi

Which should be exactly what you need.