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PHP提取字符串中的数字

WBOY
WBOYOriginal
2016-06-07 11:43:111165browse

PHP提取字符串中的数字,摘自网络。
第一种方法,使用正则表达式:function findNum($str=''){<br>         $str=trim($str);<br>         if(empty($str)){return '';}<br>         $reg='/(\d{3}(\.\d+)?)/is';//匹配数字的正则表达式<br>         preg_match_all($reg,$str,$result); if(is_array($result)&&!empty($result)&&!empty($result[1])&&!empty($result[1][0])){<br>             return $result[1][0];<br>         }<br>         return '';<br>     }第二种方法,使用in_array方法:function findNum($str=''){<br>         $str=trim($str);<br>         if(empty($str)){return '';}<br>         $temp=array('1','2','3','4','5','6','7','8','9','0');<br>         $result='';<br>         for($i=0;$i<strlen></strlen>             if(in_array($str[$i],$temp)){<br>                 $result.=$str[$i];<br>             }<br>         }<br>         return $result;<br>     }第三种方法,使用is_numeric函数:function findNum($str=''){<br>         $str=trim($str);<br>         if(empty($str)){return '';}<br>         $result='';<br>         for($i=0;$i<strlen></strlen>             if(is_numeric($str[$i])){<br>                 $result.=$str[$i];<br>             }<br>         }<br>         return $result;<br>     }

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