Problem in displaying the WordPress shortcode function randomly

Question

I have a shortcode function similar to the following code:

function my_shortcode() {
    $arr = array( 
        '1' => '<a href="https://google.com"> <img src="img_1.jpg" /> </a>', 
        '2' => '<a href="https://yahoo.com"> <img src="img_2.jpg" /></a>', 
        '3' => '<a href="https://apple.com"> <img src="img_3.jpg" /></a>',
        '4' => '<a href="https://zdf.com"> <img src="img_4.jpg" /></a>',
        '5' => '<a href="https://air.com"> <img src="img_5.jpg" /></a>',
        '6' => '<a href="https://bing.com"> <img src="img_6.jpg" /></a>' 
    );
    $key = array_rand($arr);
    return print_r($arr[$key]);
}
add_shortcode('joke', 'my_shortcode');

And I plan to use this function in several different places of different posts and each of these shortcodes will randomly execute one of the commands of the function.

This shortcode function is supposed to display a linked image. I want, for example, if I use this shortcode 3 times in one post [joke], I don't want it to display a duplicate value! (I want to display a different value every three times I use it in a post)

Krunal Bhimajiyani · Accepted Answer · 2023-09-21 10:24:39Z

2

By using $GLOBALS we can achieve this. $GLOBALS['my_shortcode_used'] is a custom global variable that stores information specific to the [joke] shortcode per-post basis, preventing duplicate values from being displayed within the same post.

function my_shortcode() {
    $values = [
        '1' => '<a href="https://google.com"> <img src="img_1.jpg" /> </a>',
        '2' => '<a href="https://yahoo.com"> <img src="img_2.jpg" /></a>',
        '3' => '<a href="https://apple.com"> <img src="img_3.jpg" /></a>',
        '4' => '<a href="https://zdf.com"> <img src="img_4.jpg" /></a>',
        '5' => '<a href="https://air.com"> <img src="img_5.jpg" /></a>',
        '6' => '<a href="https://bing.com"> <img src="img_6.jpg" /></a>',
    ];

    if ( ! isset( $GLOBALS['my_shortcode_used'] ) ) {
        $GLOBALS['my_shortcode_used'] = [];
    }

    $post_id = get_the_ID();

    if ( ! isset( $GLOBALS['my_shortcode_used'][ $post_id ] ) || ! is_array( $GLOBALS['my_shortcode_used'][ $post_id ] ) ) {
        $GLOBALS['my_shortcode_used'][ $post_id ] = [];
    }

    $unused_values = array_diff( $values, $GLOBALS['my_shortcode_used'][ $post_id ] );

    if ( empty( $unused_values ) ) {
        $GLOBALS['my_shortcode_used'][ $post_id ] = [];
        $unused_values                            = $values;
    }

    $key = array_rand( $unused_values );

    $GLOBALS['my_shortcode_used'][ $post_id ][] = $unused_values[ $key ];

    return $unused_values[ $key ];
}
add_shortcode( 'joke', 'my_shortcode' );

Now use shortcode three times in you single.php

    echo do_shortcode( '[joke]' );
    echo do_shortcode( '[joke]' );
    echo do_shortcode( '[joke]' );

edited Sep 21, 2023 at 10:24

answered Sep 21, 2023 at 9:24

Krunal Bhimajiyani

1,1895 silver badges14 bronze badges

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3 Comments

SubZer0 Over a year ago

that was perfect, It only displays this warning, what could be the reason? Warning: Undefined array key in /public_html/wp-content/themes/test-child/index.php on line 20 ( if ( ! is_array( $GLOBALS['my_shortcode_used'][ $post_id ] ) ) {)

Krunal Bhimajiyani Over a year ago

if ( ! isset( $GLOBALS['my_shortcode_used'][ $post_id ] ) || ! is_array( $GLOBALS['my_shortcode_used'][ $post_id ] ) ) Please replace the above condition with this condition.

SubZer0 Over a year ago

It was wonderful, thank you

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