How to get only numbers in php

php method to achieve only obtaining numbers: 1. Use the preg_match_all() function with regular expressions to obtain numbers, the syntax "preg_match_all('/(\d{3}(\.\d )?)/is ',$str,$result);"; 2. Define a string containing numbers from 0 to 9, traverse the array, and use the "in_array($str[$i],$temp)" statement to extract the numbers in the string; 3. Use the "is_numeric" function to get the number.

The operating environment of this article: windows7 system, PHP8 version, DELL G3 computer

PHP extracts the numbers in the string

PHP extracts the first group of numbers in the string

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

Other methods for PHP to extract the numbers in the string

The first method uses regular expressions:

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;
}

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