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//Õâ¸öʱºòÊä³öµÄΪbaicai¶ø²»ÊÇbai123cai,ÒòΪstr("pao")<strlen("bai123")
echo strtr("paocai!","pao","bai123");
?>
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//Õâ¸öʱºòÊä³öµÄΪlaocai¶ø²»ÊÇlacai,ÒòΪstr("pao")>strlen("la")
 
echo strtr("paocai!","pao","la");
 
?>
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<?php
$Arr=array('ao'=>'oa','ai'=>'ia');
echo strtr("paocai!",$Arr); //Õâ¸öʱºòÊä³öµÄΪpoacia
?>
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echo str_replace("you","paocai","I love you!"); //»áÊä³öI love paocai!
?>
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