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Notice (8): SplFileObject::fwrite() [<a href='https://secure.php.net/splfileobject.fwrite'>splfileobject.fwrite</a>]: Write of 284 bytes failed with errno=28 No space left on device [CORE/src/Cache/Engine/FileEngine.php, line 141]

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php trim 函数去除空字符使用说明 - 站长搜索
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php trim 函数去除空字符使用说明

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2014-12-07 13:45:05 转载来源: 网络整理/侵权必删

本文为大家讲解的是php下 trim 函数去除空字符使用说明,感兴趣的同学参考下。 定义和用法 trim() 函数从字符串的两端删除空白字符和其他预定义字符

本文为大家讲解的是phptrim 函数去除字符使用说明,感兴趣的同学参考下。

定义和用法
trim() 函数从字符串的两端删除空白字符和其他预定义字符。

语法
trim(string,charlist)参数 描述

string 必需。规定要检查的字符串。

charlist 可选。规定要转换的字符串。如果省略该参数,则删除以下所有字符:


"�" - NULL
"t" - tab
"n" - new line
"x0B" - 纵向列表符
"r" - 回车
" " - 普通空白字符


例子1


<?php
$str = " 使用函数trim去掉字符串两端空白字符 ";
$str1 = trim($str); echo "处理前有".strlen($str)."个字符";
echo "<br/>";
echo "<br/>";
echo "使用trim函数处理后有".strlen($str1)."个字符";
?>


输出:

处理前有39个字符 使用PHP函数trim()处理后有34个字符

例子2

 


<?php
$str = "##使用函数trim去掉字符串两端特定字符####";
$str1 = trim($str,"#"); //为函数trim传入第二个参数,trim将删除字符串$str两端的#字符
echo $str."<br>";
echo $str1;
?>


输出:
##使用PHP函数trim()去掉字符串两端特定字符#### 使用函数trim去掉字符串两端特定字符

 

 


标签: php trim 函数 去除 字符 使用说明


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