array_combine(): keys of one array and values of another

$input1=array('One','Two','Three','Four','Five');
$input2=array(1,2,3,4,5);
$output=array_combine($input1,$input2);
print_r($output);

Array ( [One] => 1 [Two] => 2 [Three] => 3 [Four] => 4 [Five] => 5 )

array_combine ($input_array1 ,$input_array2 )

Example 1: Handling Mismatched Array Lengths

<?php
$keys = ['name', 'email'];
$values = ['John Doe', 'john@example.com', 25]; // Extra value

// This will trigger a warning because the arrays are not of equal length
$result = @array_combine($keys, $values);
if ($result === false) {
    echo "Error: Arrays must have the same length!";
} else {
    print_r($result);
}
?>

Error: Arrays must have the same length!

Example 2: Real-World Use Case - Combining Form Labels and User Input

<?php
$labels = ['Name', 'Email', 'Age'];
$userInput = ['Alice', 'alice@example.com', 28];

// Combining form labels with user input
$formData = array_combine($labels, $userInput);

print_r($formData);
?>

Array
(
    [Name] => Alice
    [Email] => alice@example.com
    [Age] => 28
)

Example 3: Handling NULL values in Combined Arrays

<?php
$keys = ['Name', 'Email'];
$values = ['Bob', null]; // Null value in the array

$combined = array_combine($keys, $values);

// Check for null values
foreach ($combined as $key => $value) {
    if (is_null($value)) {
        echo "$key has no value set.<br>";
    } else {
        echo "$key: $value<br>";
    }
}
?>

Name: Bob
Email has no value set.

Subhendu Mohapatra

Author & Instructor at plus2net

I write and maintain practical tutorials on Python, PHP, SQL, JavaScript, HTML, jQuery, and web development at plus2net. The tutorials focus on clear explanations, working examples, and code that readers can test and adapt while learning.

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