Summary of methods for extracting numbers from strings in PHP (code)-PHP Tutorial-php.cn

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

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Release： 2023-04-03 14:52:02

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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];
    }
?>

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Other methods for PHP to extract numbers in a string

The first method is to use regular expressions Formula:

function findNum($str=&#39;&#39;){
$str=trim($str);
if(empty($str)){return &#39;&#39;;}
$reg=&#39;/(\d{3}(\.\d+)?)/is&#39;;//匹配数字的正则表达式
preg_match_all($reg,$str,$result);
if(is_array($result)&&!empty($result)&&!empty($result[1])&&!empty($result[1][0])){
return $result[1][0];
}
return &#39;&#39;;
}

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The second method, use the in_array method:

function findNum($str=&#39;&#39;){
$str=trim($str);
if(empty($str)){return &#39;&#39;;}
$temp=array(&#39;1&#39;,&#39;2&#39;,&#39;3&#39;,&#39;4&#39;,&#39;5&#39;,&#39;6&#39;,&#39;7&#39;,&#39;8&#39;,&#39;9&#39;,&#39;0&#39;);
$result=&#39;&#39;;
for($i=0;$i<strlen($str);$i++){
if(in_array($str[$i],$temp)){
$result.=$str[$i];
}
}
return $result;
}

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The third method, use the is_numeric function:

function findNum($str=&#39;&#39;){
$str=trim($str);
if(empty($str)){return &#39;&#39;;}
$result=&#39;&#39;;
for($i=0;$i<strlen($str);$i++){
if(is_numeric($str[$i])){
$result.=$str[$i];
}
}
return $result;
}

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For example:

//截取字符串中的数字2
    $str =&#39;Q币2个&#39;;
    $result=&#39;&#39;;
    for($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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