str_replace、preg_replace、strtr比较

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str_replace函数比preg_replace函数快，但strtr函数的效率是str_replace函数的四倍。

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

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