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 $str 所有新行之前插入'<br/>'
8, array conversion to string, string conversion to array
implode($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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