Cast _php base of PHP variable type

In other words, if you assign a string value to a variable var,var, it becomes a string. If you assign an integer value to Var, it becomes an integer.
Type casts in PHP are very similar to those in C: precede the variables to be converted with the target type enclosed in parentheses.

Copy Code code as follows:

<?php
$foo = 10;
echo "before conversion: \ $foo =". $foo; Output an integer
echo "<br/>"/output: $foo =10
echo "<br/>";
$foo = (Boolean) $foo; Cast to Boolean
echo "after conversion: \ $foo =". $foo; Output: $foo =1
?>

The allowed casts are:
(int), (integer)-Convert to integral type
(bool), (Boolean)-Convert to Boolean
(float), (double), (real)-Convert to floating-point type
(string)-Convert to String
(array)-Convert array
(object)-Convert to Object