PHP programming language is very, very free. Because of this, unfortunately, there are many ways to write the same thing and not to know what can be better. In this topic, I will describe a few small things that are useful for beginners and slightly advanced PHP programmers.

Content

• echo or print
• Build text to display
• Meaning?>
• require, include, readfile
• Write to file

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echo

print

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echo

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($success) ? echo '!': echo '...';

<br>

print

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echo ($success) ? '!' : '...';.

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print

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echo

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echo

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print

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echo "Hello, $name!";

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echo "Hello\nworld!";

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echo "${config['hello']}, ${position}th world!";

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echo

:

echo string $arg1 [, string $...] )

, . .

echo 'Hello,' , 'world!';

echo 'Hello,' . 'world!';

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heredoc?

PHP «HEREDOC». :

echo <<<HEREDOC<br>
Hello,<br>
world,<br>
I love you!<br>
HEREDOC;<br>

«HEREDOC» .

, , , .

define('N',PHP_EOL); echo 'foo' . N;

echo "foo\n";<br>
echo 'foo' . "\n";

, .

?>

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header()

.

functions.php:<br>
<php<br>
function foo()<br>
{<br>
...<br>
}<br>
function bar()<br>
{<br>
...<br>
}<br>

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require, include, readfile

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readfile

readfile

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include require

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require

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include

warning, . — require .

..._once?

include 

require

«_once»:

include_once; require_once<

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require_once

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PHP :

file_put_contents('filename','data');

backwards-compatibility, :

// File put contents
if (!defined('FILE_APPEND')) define('FILE_APPEND',1);
if (!function_exists('file_put_contents'))
{
	function file_put_contents($n, $d, $flag = false) {
		$mode = ($flag == FILE_APPEND || strtoupper($flag) == 'FILE_APPEND') ? 'a' : 'w';
		$f = @fopen($n, $mode);
		if ($f === false) {
			return 0;
		} else {
			if (is_array($d)) $d = implode($d);
			$bytes_written = fwrite($f, $d);
			fclose($f);
			return $bytes_written;
		}
	}
}