DEV Community: leichengde

How to extract the first set of numbers in a string using PHP

leichengde — Sat, 23 Jul 2022 00:26:16 +0000

How to extract the first set of numbers in a string using PHP

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

Other ways to extract numbers from strings in PHP

The first method, using regular expressions:

The second method, using the in_array method:

The third method, using 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;
}

E.g:

//Intercept the number 2 in the string
$str = 'Q coins 2';
$result='';
for($i=0;$i<strlen($str);$i++){
if(is_numeric($str[$i])){
$result.=$str[$i];
}
}
print_r($result);die;
// output result 2

PHP request interface API: a relatively complete example (POST)

leichengde — Sun, 03 Jul 2022 07:37:50 +0000

1：Send via curl
[Scenario: Get table information in remote server based on id]

<?php
//interface url
$url = '';
//data field
    $data = 'id=35289';
    // method to generate http header information
function getAuthHeaders(){
//appid needs to apply in advance
$appid = '';
$time = time();
//appkey needs to apply in advance
$appkey = '';
//Signature here we use the md5 of the following three
$sign = md5($appid . '&' . $time . $appkey);
return array(
            'Content-Type : application/json',
            'charset : '.'utf-8',
            //We also send the appid, TimeStamp, and signature to the server,
            //Request it to query whether the md5 signature of appkey authentication is correct or not through appid
'X-Auth-Appid : ' . $appid,
'X-Auth-TimeStamp : ' . $time,
'x-Auth-Sign : ' . $sign
        );
}
$ch = curl_init();
//address to visit
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_HEADER, false);
curl_setopt($ch, CURLOPT_HTTPHEADER, getAuthHeaders());
//Whether the execution result is returned, 0 is to return, 1 is not to return
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 0);
// Send a regular POST request
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
// execute and get data
$output = curl_exec($ch);
print_r($output);
    curl_close($ch);
?>