php - 如何使用 php 根据值的开头过滤值？

Question

如何使用 php 只接受以“09”开头的值？例如，仅value 1且value 3应在此列表中接受：

 value 1 ="09888111222";
 value 2 ="02999111222";
 value 3 ="09999111111";

我做完了...

$cno="09888111222";
$countc=strlen($cno);
$countc1=-$countc+2;
$rest = substr($cno, 0, $countc1); 
if($rest==07){
echo $rest;
}else{
echo "Value not starts with 07";
}

Answer 1

if (substr($value, 0, 2) === '09') {
    // Do something here... your string in $value starts with "09"
}

http://php.net/substr