PHP Variable Handling Functions Example

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Hi guys,

Today i will explained how to use variable handling functions in php. This example is so easy to use in php.

This functions is provided to the php language. So you can use easily in your php code. Today i will explaind to the boolval(),empty(),floatval(),gettype(),is_array() to explainded.

So let's start to the example.

boolval() Function

The boolval() is a return to the boolean value of the variable.

<?php
    echo "0: " .(boolval(0) ? 'true' : 'false') . "<br>";
    echo "4: " .(boolval(42) ? 'true' : 'false') . "<br>";
    echo '"": ' .(boolval("") ? 'true' : 'false') . "<br>";
    echo '"Hello": ' .(boolval("Hello") ? 'true' : 'false') . "<br>";
    echo '"0": ' .(boolval("0") ? 'true' : 'false') . "<br>";
    echo "[3, 5]: " .(boolval([3, 5]) ? 'true' : 'false') . "<br>";
    echo "[]: " .(boolval([]) ? 'true' : 'false') . "<br>";
?>

Output

0: false
4: true
"": false
"Hello": true
"0": false
[3, 5]: true
[]: false

empty() Function empty() is check to the variable is a empty or not. empty() function is return false if variable is exist and is not empty otherwise return true.

<?php
    $value = 0;
    if (empty($value)) {
      echo "Variable 'value' is empty.<br>";
    }
    if (isset($value)) {
      echo "Variable 'value' is set";
    }
?>

Output

Variable 'value' is empty.
Variable 'value' is set.

floatval() Function floatval() function returns the float value of the variable.

<?php
    $value1 = "1234.56789";
    echo floatval($value1) . "<br>";
    $value2 = "1234.56789Hello";
    echo floatval($value2) . "<br>";
    $value3 = "Hello1234.56789";
    echo floatval($value3) . "<br>";
?>

Output

1234.56789
1234.56789
0

gettype() Function gettype() function is returns to the type of variable.

<?php
    $value1 = 3;
    echo gettype($value1) . "<br>";
    $value2 = 3.2;
    echo gettype($value2) . "<br>";
    $value3 = "Hello";
    echo gettype($value3) . "<br>";
    $value4 = array();
    echo gettype($value4) . "<br>";
    $value5 = array("red", "green", "blue");
    echo gettype($value5) . "<br>";
    $value6 = NULL;
    echo gettype($value6) . "<br>";
    $value7 = false;
    echo gettype($value7) . "<br>";
?>

Output

integer
double
string
array
array
NULL
boolean

is_array() Function is_array() function checks whether a variable is an array or not. This function is return the variable is array then true otherwise return false.

<?php
    $value = "Hello";
    echo "value is " . is_array($value) . "<br>";
    $value2 = array("red", "green", "blue");
    echo "value2 is " . is_array($value2) . "<br>";
    $value3 = array("Peter"=>"35", "Ben"=>"37", "Joe"=>"43");
    echo "value3 is " . is_array($value3) . "<br>";
    $value4 = "red, green, blue";
    echo "value4 is " . is_array($value4) . "<br>";
?>

Output

value is
value2 is 1
value3 is 1
value4 is

Now you can check your own.