How to convert php character type to integer type

How to convert php character type to integer type: 1. Create a PHP sample file; 2. Pass "foreach($arr as $key=>$val){print($key == "aa" ? 5: $val);}" or "((int)('132very'));" to convert the character type into an integer.

The operating environment of this tutorial: Windows 7 system, PHP version 8.1, Dell G3 computer.

php character type to integer type

 $arr = array(0=>1,"aa"=>2, 3, 4);
  
 foreach($arr as $key=>$val){
     print($key == "aa" ? 5 : $val);
 }

Output result: 5534

why:

When two values ​​are logically judged in PHP, if two If the types of the values ​​are inconsistent, PHP will automatically convert the value on the right to the type on the left,

and then make a judgment. Therefore, the "aa" conversion integer is equal to 0, which is naturally equal to the 0 on the left.

Character type conversion to integer type

Example:

 ((int)('b'));                     //0
    ((int)('very good'));       //0
    ((int)('132very'));             //132
    ((int)('ver1323'));            //0

We can draw the rule: if it starts with a valid number, take the valid number. Anything starting with a non-valid number is converted to 0;

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