Check if a string contains a certain number

I have a string

8,7,13,14,16

Whats the easiest way to determine if a given number is present in that string?

$numberA = "13";
$string = "8,7,13,14,16";

if($string magic $numberA){
$result = "Yeah, that number is in there";
} else {
$result = "Sorry.";
}

Looking for magic.

---

<?php 
in_array('13', explode(',', '8,7,13,14,16'));
?>

…will return whether '13' is in the string.

Just to elaborate: explode turns the string into an array, splitting it at each ',' in this case. Then, in_array checks if the string '13' is in the resulting array somewhere.

---

另一种方式，对laaaaaaaarge字符串可能更有效，它使用正则表达式：

$numberA = "13";
$string = "8,7,13,14,16";

if(preg_match('/(^|,)'.$numberA.'($|,)/', $string)){
    $result = "Yeah, that number is in there";
} else {
    $result = "Sorry.";
}

---

if (strpos(','.$string.',' , ','.$numberA.',') !== FALSE) {
    //found
}

注意守卫'，'字符，他们将帮助处理'13'魔法'1,2,133'的情况。

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