PHP Shortcode

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Based on kukukuan’s Inline PHP, this plugin allows you to embed and run PHP code in posts, pages or widgets* with a WordPress shortcode. (* Requires a shortcode enabled widget plugin, such as Section Widget.) Usage The plugin provides two pairs of shortcodes – [php]code[/php] and [echo]code[/echo]. these two pairs of shortcodes resembles the functionality of the <?php code ?> and <?= code ?> tags in a normal PHP script, respectively. For example: The answer to the <em>ultimate</em> math challenge, <strong>1+2</strong>, is... [php] $a = 1; $b = 2; echo $a + $b; [/php] Will become: The answer to the <em>ultimate</em> math challenge, <strong>1+2</strong>, is... 3 The [echo] tag will automatically print the returned value of the first expression. Therefore, [echo]some_function()[/echo] is essentially equivalent to [php]echo some_function()[/php]. Some Important Notes ** This plugin will change the priority of the do_shortcode filter. If you are experiencing any conflict with other shortcode plugins, please disable the plugin and report the problem in the forums. ** Although I said the shortcode pairs resembles a <?php code ?> tag pair, there is an important difference. The PHP code in the shortcodes are executed in a “throw-away” local namespace, instead of the global one. All variables defined in a [php] code [/php] block cannot be accessed outside the block. Therefore, this will not work: [php] $a = 1; $b = 2; [/php] The answer to the <em>ultimate</em> math challenge, <strong>1+2</strong>, is... [echo]$a+$b[/echo] And neither would this: [php] $my_array = array('apple','orange'); foreach($my_array as $fruit): [/php] I like [echo]$fruit[/echo] [php]endforeach;[/php] To work around the first problem, you may use the global keyword: [php] global $a, $b; $a = 1; $b = 2; [/php] The answer to the <em>ultimate</em> math challenge, <strong>1+2</strong>, is... [php]global $a, $b; echo $a+$b[/php] And to work around the second problem, you may use “real” PHP closing tags within your [php] code [/php] block to switch between PHP and HTML mode: [php] $my_array = array('apple','orange'); foreach($my_array as $fruit): ?> I like <?php echo $fruit; ?> <?php endforeach; [/php] (Yes, it is a bit weird… you’d probably want to avoid doing that if possible.)