There are several forms of PHP coercion

There are several forms of forced conversion in PHP

There are three forms of forced conversion in PHP: 1. Add the expression before the variable to be converted. The target type enclosed in parentheses; 2. Use the conversion function, such as "intval()", "strval()"; 3. Use the "settype()" function, just pass the variable to be converted into the first parameter and Just pass the second parameter into the data type name.

Sample code

$a = '12';
$res = (int)$a;
var_dump($a);  //原变量不影响
var_dump($res);//返回的值为整型

$a = '12';
$res = intval($a);
var_dump($a); //不改变原变量
var_dump($res);

$a = '12';
settype($a,'integer');
var_dump($a); // 改变原变量 返回值是一个布尔型

Recommended tutorial: "PHP Tutorial"

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