PHP Strings

Common string functions.

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PHP has hundreds of string functions. The most useful:

strlen(): length
str_word_count(): number of words
strtoupper(), strtolower(), ucfirst(), ucwords()
str_replace(search, replace, subject)
strpos() and str_contains(): search
substr(): part of a string
trim(), explode(), implode(), sprintf()

Key Takeaways: PHP Strings

Mastering PHP Strings 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 Strings Code Example

PHP

<?php
$text = "  learn php at codesintech  ";
$clean = trim($text);

echo strlen($clean) . "<br>";
echo ucwords($clean) . "<br>";
echo str_replace("php", "Laravel", $clean) . "<br>";
echo substr($clean, 6, 3) . "<br>";
var_dump(str_contains($clean, "codes"));
echo "<br>" . implode(" | ", explode(" ", $clean));
echo "<br>" . sprintf("%05.1f%%", 7.5);

Output

24
Learn Php At Codesintech
learn Laravel at codesintech
php
bool(true)
learn | php | at | codesintech
007.5%

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

PHP Strings Practice Exercises

Check what you learned in “PHP Strings”.

/ 2 solved

Fill in the blank

Get the length of a string.

echo ("Hello");

✓ Correct! Not quite. Try again.

Multiple choice

Which function replaces text inside a string?

str_replace() replace() str_swap() substr()

✓ Correct! Not quite. Try again.

to save your exercise progress.

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PHP Strings

💡 Key Takeaways: PHP Strings

PHP Strings Code Example

PHP Strings Practice Exercises

Key Takeaways: PHP Strings