PHP Array Functions

Sort, filter, map and search arrays.

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Sorting: sort(), rsort(), asort() / arsort() (by value, keep keys), ksort() / krsort() (by key), usort() (custom)
array_map(), array_filter(), array_reduce()
in_array(), array_search(), array_key_exists()
array_merge(), array_slice(), array_unique(), array_keys(), array_values(), array_sum()

Key Takeaways: PHP Array Functions

Mastering PHP Array Functions helps you write clean and reliable PHP code. Follow standard conventions, test edge cases, and keep logic simple. Try running the code example below and complete the exercises to build confidence.

PHP Array Functions Code Example

PHP

<?php
$marks = [72, 95, 58, 88];

$passed = array_filter($marks, fn($m) => $m >= 60);
$curved = array_map(fn($m) => $m + 5, $marks);
rsort($marks);

echo implode(", ", $passed) . "<br>";
echo implode(", ", $curved) . "<br>";
echo implode(", ", $marks) . "<br>";
echo "Total: " . array_sum($marks) . "<br>";
var_dump(in_array(95, $marks));

Output

72, 95, 88
77, 100, 63, 93
95, 88, 72, 58
Total: 313
bool(true)

Run this example on your own computer. The "Get Started" lesson shows how to set it up.

PHP Array Functions Practice Exercises

Check what you learned in “PHP Array Functions”.

/ 2 solved

Fill in the blank

Keep only items that pass a test.

$passed = ($marks, fn($m) => $m >= 60);

✓ Correct! Not quite. Try again.

Multiple choice

Which function sorts an associative array by value and keeps the keys?

asort() sort() ksort() usort()

✓ Correct! Not quite. Try again.

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PHP Array Functions

💡 Key Takeaways: PHP Array Functions

PHP Array Functions Code Example

PHP Array Functions Practice Exercises

Key Takeaways: PHP Array Functions