Comparison between PHP strtr and Str_replace

Comparison between PHP strtr and Str_replace

Functions have the ability to replace characters. But the STRTR is 4 times times more than the str_replace performance. Specific circumstances, please

Look at the following decomposition:

The first is the STRTR function:

Example 1: When

The following are the referenced contents:

<?php

This time the output is Baicai rather than Bai123cai, because str ("Pao") <strlen ("bai123")

Echo strtr ("paocai!", "Pao", "bai123");

?>

Instance 2: When the replaced value is less than the replacement target

The following are the referenced contents:

<?php

This time the output is Laocai rather than Lacai, because str ("Pao") >strlen ("La")

Echo strtr ("paocai!", "Pao", "la");

?>

Example 3: Array substitution support

The following are the referenced contents:

<?php

$Arr =array (' ao ' => ' oa ', ' ai ' => ' ia ');

Echo strtr ("paocai!", $ARR); This time the output is Poacia

?>

The second is str_replace:

The following are the referenced contents:

<?php

Echo str_replace ("You", "Paocai", "I Love you!"); Will output I love paocai!

?>

Summary: STRTR He is related to the length of the character, but Str_replace is not related, estimated in the running step

Will read the string length so it is much slower than STRTR.