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                **獲取字符串的長度:** strlen() ``` strlen('Hello World'); ``` **字符串翻轉:** strrev() ``` strrev('Hello World'); ``` **查找一個字符串在另一個字符串中的位置:** strpos() ``` strpos('Hello World','World'); ``` **字符串替換:** str_replace(); ``` str_replace('World','list','Hello World'); ``` **數字格式化** ``` $num = 4.30258; 第一種:利用php round方法對浮點數進行四舍五入 echo round($num, 2); //4.30 第二種:利用sprintf格式化字符串 $format_num = sprintf("%.2f", $num); echo $format_num; //4.30 第三種:利用千位分組來格式化數字的函數number_format() echo number_format($num, 2, ".", ""); //4.30 ``` **全部轉換成小寫** ``` strtolower('Hello World'); ``` **全部轉換成大寫** ``` strtoupper('Hello World'); ``` **時間格式的字符串轉換成整型時間戳** ``` strtotime($str); ``` **去除不含$tags里標簽外的所有標簽** ``` strip_tags($str [,$tags]); ``` **編碼成json 格式的字符串** ``` json_encode($obj/$arr/$str...); ``` **解碼成對象,當$assoc=true 時 返回數組 而非對象** ``` json_decode($jsonstr [,$assoc=true]); ``` **將一維數組轉換為字符串** ``` implode($arr,$glue); ``` **字符串轉換為數組** ``` explode(); ``` **字符串加密函** ``` sha1($str); md5($str); ``` 截取字符串$str的第一個字符截取長度3長度不填默認截取到最后參數為負數則倒數 ``` substr($str,0,3); ``` **截取字符串 $str 中的第一個字符'a'后的字符串** ``` strstr($str,'a'); ``` 截取字符串 $str 中最后一一個字符'a'后的字符串 ``` strrchr($str,'a'); ```
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