dongshi6710
2013-05-14 12:49
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PHP trim / rtrim / ltrim VS正则表达式

I tend to use rtrim, ltrim and trim to strip off spaces at the end, left or right. I also use them to strip off the characters at the end or the beginning of the string. Is it faster than a regular expression? Is there anything wrong with the following code?

 $string = " hello: ";
 $string = rtrim(trim($string), ":"); //hello

Would it make any difference if I were to use a regular expression in terms of performance?

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我倾向于使用 rtrim ， ltrim 和修剪以去除末端，左侧或右侧的空格。 我还使用它们去除字符串末尾或字符串开头的字符。 它比正则表达式更快吗？ 以下代码有什么问题吗？ 

  $ string =“hello：”; 
 $ string = rtrim（trim（$ string），“：”）;  // hello 
   
 
 
如果我在性能方面使用正则表达式会有什么不同吗？
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1条回答 默认 最新

  • dqaxw44567 2013-05-14 12:54
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    Regular expressions usually make things slower, especially applied to such small strings, due to the expression analysis overhead.

    Assuming that a colon would never appear on the left side, you could eliminate the rtrim():

    $string = trim($string, ": "); // trim either space or colon on either side
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