Type casting syntax in PHP - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is type casting in PHP?

Type casting in PHP is the process of converting a variable from one data type to another, like turning a string into an integer.

beginner

How do you cast a variable to an integer in PHP?

You put (int) or (integer) before the variable. Example: $num = (int) '123'; converts the string '123' to the integer 123.

beginner

Which of these is the correct way to cast a variable to a boolean in PHP?<br>$var = ? 'value';

The correct way is $var = (bool) 'value'; or $var = (boolean) 'value'; to convert to boolean true or false.

intermediate

What happens if you cast a float to an integer in PHP?

The decimal part is removed, and only the whole number part remains. For example, (int) 3.9 becomes 3.

intermediate

List the common type casting syntaxes in PHP.

Common casts are:<br>- (int) or (integer)<br>- (bool) or (boolean)<br>- (float), (double), or (real)<br>- (string)<br>- (array)<br>- (object)<br>- (unset) to null

Which syntax correctly casts a variable to a string in PHP?

A (string) $var

B string($var)

C $var->string()

D cast string $var

In PHP, you cast by putting the type in parentheses before the variable, like (string) $var.

What will be the result of (bool) 0 in PHP?

A 0

B true

C false

D Error

Casting 0 to boolean results in false because 0 is considered false in PHP.

How do you cast a variable to a float in PHP?

A (float) $var

B float($var)

C $var as float

D cast($var, float)

The correct syntax is (float) $var to cast to a floating-point number.

What does (array) $var do in PHP?

A Checks if $var is an array

B Converts $var to an array

C Removes $var

D Converts $var to a string

Casting to (array) converts the variable into an array type.

Which of these is NOT a valid PHP type cast?

A (unset)

B (boolean)

C (object)

D (char)

PHP does not have a (char) cast. Characters are strings of length 1.

Explain how to convert a variable to an integer and a boolean in PHP using type casting syntax.

Remember to put the type in parentheses before the variable.

List at least four common type casts in PHP and describe what they do.

Think about converting between numbers, true/false, text, and lists.