what is string in php

In PHP, a string is a continuous sequence of characters, consisting of a series of characters, where each character is equivalent to one byte. There are three ways to define a string: 1. Use single quotes to wrap characters, the syntax is "'string content'"; 2. Use double quotes to wrap characters, the syntax is ""string content""; 3. Use the heredoc syntax structure "

The operating environment of this tutorial: Windows 7 system, PHP version 8.1, DELL G3 computer

Characters in php String

A string is a continuous sequence of characters, consisting of a series of characters, where each character is equivalent to one byte.

In other languages, characters and strings are two different data types, but in PHP, characters and strings are uniformly regarded as string data types.

In PHP, there are three ways to define strings, namely single quotation mark method, double quotation mark method, and Heredoc method.

Use single quotes to define strings

<?php
echo &#39;this is a simple string&#39;;
?>

##Use double quotes to define strings

Like single-quoted strings, escaping any other characters will cause the backslash to be displayed.

<?php
echo "this is a simple string";
?>

Heredoc structure

<?php
$str = <<<EOF
  url:
  https://www.php.cn/
EOF;
echo $str;
?>

Recommended learning: "

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