Summary of methods for extracting numbers from strings in PHP (code)

This article introduces to you a summary (code) of the method of extracting numbers from strings in PHP. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

PHP extracts the first group of numbers in a string

<?php
    $str=&#39;acc123nmnm4545&#39;;
    if(preg_match(&#39;/\d+/&#39;,$str,$arr)){
       echo $arr[0];
    }
?>

Other methods for PHP to extract numbers in a string

The first method is to use regular expressions Formula:

function findNum($str=''){
$str=trim($str);
if(empty($str)){return '';}
$reg='/(\d{3}(\.\d+)?)/is';//匹配数字的正则表达式
preg_match_all($reg,$str,$result);
if(is_array($result)&&!empty($result)&&!empty($result[1])&&!empty($result[1][0])){
return $result[1][0];
}
return '';
}

The second method, use the in_array method:

function findNum($str=''){
$str=trim($str);
if(empty($str)){return '';}
$temp=array('1','2','3','4','5','6','7','8','9','0');
$result='';
for($i=0;$i<strlen($str);$i++){
if(in_array($str[$i],$temp)){
$result.=$str[$i];
}
}
return $result;
}

The third method, use the is_numeric function:

function findNum($str=''){
$str=trim($str);
if(empty($str)){return '';}
$result='';
for($i=0;$i<strlen($str);$i++){
if(is_numeric($str[$i])){
$result.=$str[$i];
}
}
return $result;
}

For example:

//截取字符串中的数字2
    $str ='Q币2个';
    $result='';
    for($i=0;$i<strlen($str);$i++){
        if(is_numeric($str[$i])){
            $result.=$str[$i];
        }
    }
    print_r($result);die;
    //输出结果 2

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