In PHP, is conditional functions are used to check whether a variable is of a certain type or has a specific property. They help ensure data correctness before processing.
? Key Concepts
is_array() — Checks if a variable is an array
is_bool() — Checks if a variable is boolean
is_float() — Checks if a variable is float
is_int() — Checks if a variable is integer
is_null() — Checks if a variable is NULL
is_numeric() — Checks numeric values or numeric strings
is_object() — Checks if a variable is an object
is_string() — Checks if a variable is string
? Syntax / Theory
Each is function returns true or false. They are commonly used inside conditional statements to validate data types before performing operations.
? Code Example
? View Code Example
// Checking different variable types using PHP is_* functions
";
}
if (is_string($var2)) {
echo "$var2 is a string.
";
}
if (is_float($var3)) {
echo "$var3 is a float.
";
}
if (is_bool($var4)) {
echo "$var4 is a boolean.
";
}
if (is_null($var5)) {
echo "var5 is NULL.
";
}
?>
? Live Output / Explanation
The script evaluates each variable using appropriate is functions and prints messages only when conditions return true.