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Strings and regular expressions

String functions, sprintf, explode / implode, multibyte text with mb_*, and preg_* regular expressions.

Runs in Zerethon IDE · PHP 8.4 Official PHP documentation ↗
main.php 
<?php

$name = 'Ada Lovelace';
echo strtoupper($name), ' ', strlen($name), ' ', substr($name, 0, 3), ' ', strpos($name, 'Love'), "\n";
echo trim('  padded  ') . '|', ' ', str_contains($name, 'Love') ? 'yes' : 'no', ' ', str_replace('Ada', 'Augusta', $name), "\n";
echo implode('-', explode(',', 'a,b,c')), ' ', sprintf('%.2f|%5d|%03d', 3.14159, 42, 7), "\n";
echo strlen('Việt'), ' ', mb_strlen('Việt'), ' ', mb_strtoupper('việt'), "\n";

if (preg_match('/order (\d+) pending/', 'Order 12 shipped, order 7 pending', $m)) {
    echo $m[1], "\n";
}
preg_match_all('/\d+/', 'a1b22c333', $all);
echo implode(',', $all[0]), ' ', preg_replace('/\d+/', '#', 'a1b22c'), "\n";

Output

ADA LOVELACE 12 Ada 4
padded| yes Augusta Lovelace
a-b-c 3.14|   42|007
6 4 VIỆT
7
1,22,333 a#b#c
  • strlen counts bytes; for UTF-8 text (accents, Vietnamese, emoji) use the mb_* functions.
  • Write regular expressions in single quotes, with delimiters: '/\d+/'.
  • strpos returns 0 for a match at the start and false for none — compare with !== false, or use str_contains.

Related topics

Official references