Several commonly used operating functions for php strings

String related operations

Convert string type

strval($str); //转换成字符串类型
floatval($str);//转换成浮点型
intval($str); //转换成整型

2 , Case conversion (Recommended learning: PHP programming from entry to proficiency)

strtolower($str); //全部转换成小写
strtoupper($str); //全部转换成大写

3. Convert string to timestamp

strtotime($str); //时间格式的字符串转换成整型时间戳
      //注意设置时区 否则会有 8小时误差

4. Remove HTML and PHP tags

strip_tags($str [,$tags]);//去除不含$tags里标签外的所有标签

5. Convert ascii to number Number to ascii

chr(int $ascii); //数字转换成ascii
ord(string $str); //返回$str第一个字符的ascii值

6. Encoding of json And decoding

json_encode($obj/$arr/$str...);//编码成json 格式的字符串
json_decode($jsonstr [,$assoc=true]); //解码成对象
             //当$assoc=true 时 返回数组 而非对象

7, line break conversion

nl2br($str); //字符串 $str 所有新行之前插入&#39;<br/>&#39;

8, array conversion to string, string conversion to array

implode($arr,$glue);//将一维数组转换为字符串
explode();//字符串转换为数组

9. Thousand-digit split formatting

string number_format ( float $number [, int $decimals = 0 ] )
string number_format ( float $number , int $decimals = 0 , string $dec_point = '.' , string $thousands_sep = ',' )
 @param  $number 你要格式化的数字 
     $decimals 要保留的小数位数 
     $dec_point 指定小数点显示的字符 
     $thousands_sep 指定千位分隔符显示的字符

10. Remove spaces

trim(string $str [,string $charlist ]); //去左右字符
ltrim(string $str [,string $charlist ]); //去左字符
rtrim(string $str [,string $charlist ]); //去右字符

This function deletes the blank characters at the end of str and returns .

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