PHP Strings

A string is a sequence of characters wrapped in single or double quotes.

Syntax$str = "Hello" . " " . "World";

A string is any text inside quotes. PHP supports both single quotes '...' and double quotes "...".

Use the dot . operator to join two strings together.

Example

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Store a user's full name as a string variable and display it in a welcome message.
Wrap SQL query fragments in single-quoted strings to avoid variable interpolation issues.
Build an HTML email body by concatenating string segments with variable content.

Single-quoted strings are literal; double-quoted strings interpolate variables and escape sequences.

<?php
$name = 'World';

$single = 'Hello, $name!';  // Hello, $name!
$double = "Hello, $name!"; // Hello, World!

echo $single . "\n";
echo $double;

Heredoc syntax handles multi-line strings with interpolation, keeping HTML templates readable.

<?php
$user  = 'Alice';
$score = 42;

$html = <<<HTML
<p>Player: $user</p>
<p>Score: $score</p>
HTML;

echo $html;

The dot operator concatenates strings; .= appends to an existing string variable in place.

<?php
$first = 'Hello';
$last  = 'World';

$greeting  = $first . ', ' . $last . '!';
$greeting .= ' Have a great day.';

echo $greeting;