如果字符串以"xx"开头(PHP)

Question

if ($_POST['id'] beginsWith "gm") {
$_SESSION['game']=="gmod"
}
if ($_POST['id'] beginsWith "tf2") {
$_SESSION['game']=="tf2"
}

如何做到这一点,它会工作？

Answer 1

你可以使用substring

if(substr($POST['id'],0,3) == 'tf2')
 {
  //Do something
 }

编辑:修复了错误的函数名称(substring()使用过,应该是substr())

Answer 2

你可以写一个begins_with使用strpos:

function begins_with($haystack, $needle) {
    return strpos($haystack, $needle) === 0;
}


if (begins_with($_POST['id'], "gm")) {
    $_SESSION['game']=="gmod"
}

// etc

Answer 3

if (strpos($_POST['id'], "gm") === 0) {
  $_SESSION['game'] ="gmod"
}
if (strpos($_POST['id'],"tf2") === 0) {
  $_SESSION['game'] ="tf2"
}