Performance Comparison Between strtr function and str_replace function in php

Source: Internet
Author: User

The strtr function of PHP has a higher performance than the str_replace function and can be used instead of str_replace. strtr has two forms:


String strtr (string $ str, string $ from, string $)
String strtr (string $ str, array $ replace_pairs)
When the first type is used, the string length of the parameter $ from and $ to must be the same; otherwise, the extra characters (whether $ from or $ to) are ignored.

For example, $ str = 'a-= B ';

When $ from = '-=', $ to = 'cd', output 'acdb' because '-=' is of the same length as 'cd', no problem.

When $ from = '-=', $ to = 'cde', the output 'acdb' is ignored.

When $ from = '-=', $ to = 'C', output 'ac = B ',' = 'in $ from is ignored.

In the second form, there is no such problem, and redundant notes will not be ignored.

Therefore, if the strtr function is intentionally used to replace str_replace and the first form is used, pay attention to this feature, which may be a trap.

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