Home Backend Development PHP Tutorial Commonly used string processing functions in php

Commonly used string processing functions in php

Nov 29, 2016 pm 02:47 PM

下面只提供几个简单常用的函数,chop执行去除空格处理,get_html_translation_table返回转化列表到变量,定义包括HTML编码的字符串htmlentities,htmlspecialchars_decode 定义包含HTML特殊字符的字符串,nl2br quotemeta rtrim等.

定义和用法:chop() 函数从字符串的末端开始删除空白字符或其他预定义字符,该函数的 rtrim() 函数的别名.

语法:chop(string,charlist),代码如下:

$str="i'm a   teacher  ";          //定义字符串 

$result=chop($str);           //执行去除空格处理 

echo $result;            //输出结果 

定义和用法:get_html_translation_table() 函数返回被 htmlentities() 和 htmlspecialchars() 函数使用的翻译表.

语法:get_html_translation_table(function,quotestyle),代码如下:

/*/ 

$trans=get_html_translation_table(html_entities);    //返回转化列表到变量 

print_r($trans);            //输出转换表 

$str="hallo &  & krmer";         //定义字符串 

$encoded=strtr($str,$trans);         //查找字符 

echo $encoded;           //输出结果 

// 

 

$str="a 'quote' is bold";       //定义包括html编码的字符串 

echo htmlentities($str);        //输出经过处理的字符串 

echo htmlentities($str, ent_quotes);     //加上可选参数后的输出结果 

 

// 

$str='

this -> "

';        //定义包含html特殊字符的字符串 

echo htmlspecialchars_decode($str);     //输出转换后的内容 

echo "
"; 

echo htmlspecialchars_decode($str,ent_noquotes);  //不对引号进行编码的输出结果 

 

// 

 

$str="cat isn't n dog";      //定义包含换行符的字符串 

$result=nl2br($str);       //执行转换操作 

echo $result;        //输出转换后的结果 

 

// 

 

$str="hello world.(can you hear me?)";      //定义包含元字符的字符串 

$result=quotemeta($str);         //执行转换操作 

echo $result;           //输出转换后的结果 

//开源代码phpfensi.com 

// 

 

$str="hello world  ";          //定义末尾有空格的字符串 

$result=rtrim($str);          //执行转换操作 

echo $result;           //输出转换后的结果


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