php trim函数 ltrim函数 rtrim函数的差异

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Release: 2016-06-13 11:52:38
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php trim函数 ltrim函数 rtrim函数的区别

大家都知道php的trim()函数,ltrim()函数,rtrim()函数都可以去除掉空格,那么三者在用法上有什么不同的区别那?现在就来为大家一一介绍一下。
1.php trim()函数是去掉所有的空格(其实准确的来说是去掉字符串两次的所有空格),例如:
$str=" love 59biye ";<br>echo ("---".trim($str)."---");//输出---love 59biye---<br>2.php ltrim()函数是去掉字符串左侧的空格,例如:
$str=" love 59biye ";<br>echo ("---".ltrim($str)."---");//输出---love 59biye ---<br>3.php rtrim()函数是去掉字符串右侧的空格,例如:
$str=" love 59biye ";<br>echo ("---".ltrim($str)."---");//输出--- love 59biye---<br>好了,大家看出他们的具体的区别了吧。

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