shortcode php wordpress

1function create_shortcode(){
2    return "<h2>Hello world !</h2>";
3}
4add_shortcode('my_shortcode', 'create_shortcode');
5// Use [my_shortcode]

1<?php echo do_shortcode('[name_of_shortcode parameters=""]'); ?>

1function wp_demo_shortcode() { 
2
3//Turn on output buffering
4ob_start();
5$code = 'Hello World';
6ob_get_clean();
7
8 // Output needs to be return
9return $code;
10} 
11
12// register shortcode
13add_shortcode('helloworld', 'wp_demo_shortcode'); 

1// function that runs when shortcode is called
2function wpb_demo_shortcode() { 
3 
4// Things that you want to do. 
5$message = 'Hello world!'; 
6 
7// Output needs to be return
8return $message;
9} 
10// register shortcode
11add_shortcode('greeting', 'wpb_demo_shortcode'); 
12

1return do_shortcode($content);

1The pairs should be considered to be all of the attributes
2which are supported by the caller and given as a list. The
3returned attributes will only contain the attributes in the $pairs list.
4
5If the $atts list has unsupported attributes, then they will be ignored
6and removed from the final returned list.
7
8<?php 
9function shortcode_atts( $pairs, $atts, $shortcode = '' ) {
10    $atts = (array) $atts;
11    $out  = array();
12    foreach ( $pairs as $name => $default ) {
13        if ( array_key_exists( $name, $atts ) ) {
14            $out[ $name ] = $atts[ $name ];
15        } else {
16            $out[ $name ] = $default;
17        }
18    }
19 
20    if ( $shortcode ) {
21        /**
22         * Filters shortcode attributes.
23         *
24         * If the third parameter of the shortcode_atts() function is present then this filter is available.
25         * The third parameter, $shortcode, is the name of the shortcode.
26         *
27         * @since 3.6.0
28         * @since 4.4.0 Added the `$shortcode` parameter.
29         *
30         * @param array  $out       The output array of shortcode attributes.
31         * @param array  $pairs     The supported attributes and their defaults.
32         * @param array  $atts      The user defined shortcode attributes.
33         * @param string $shortcode The shortcode name.
34         */
35        $out = apply_filters( "shortcode_atts_{$shortcode}", $out, $pairs, $atts, $shortcode );
36    }
37 
38    return $out;
39}
40
41?>
42