PHP Strings

PHP has many string functions. Use double quotes to insert variables; single quotes keep text exactly as written.

ExamplePHP

<?php
$s = "Hello, PHP";
echo strlen($s) . "\n";
echo strtoupper($s) . "\n";
echo substr($s, 7) . "\n";
echo strpos($s, "PHP") . "\n";
echo str_replace("PHP", "World", $s) . "\n";
echo str_pad("7", 3, "0", STR_PAD_LEFT) . "\n";
echo ucwords("hello big world") . "\n";
print_r(explode(",", "a,b,c"));
echo implode("-", ["x", "y", "z"]) . "\n";
$n = 5;
echo 'single: $n' . "\n";
echo "double: $n\n";
echo sprintf("%05.1f", 3.14159) . "\n";

Output

10
HELLO, PHP
PHP
7
Hello, World
007
Hello Big World
Array
(
    [0] => a
    [1] => b
    [2] => c
)
x-y-z
single: $n
double: 5
003.1

Quick check

Which quotes insert variables into a string?

Single quotesDouble quotesBoth

Finish the quick check (and any code exercise) to complete this lesson, or mark it done yourself.

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