Error 500 ajax wpcf7

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  • Error 500 = server side php error, not JS..

    Note that recent CF7 versions will throw Error 500 if you use them with older WP versions ( <= WP v4.2 ).
    You will need to install older version in that case..

    Plugin Author Takayuki Miyoshi

    (@takayukister)

    Note that recent CF7 versions will throw Error 500 if you use them with older WP versions ( <= WP v4.2 ).

    No, not true.

    Not true how? You can easily verify this yourself..

    When using newer CF7 (like 4.3.x) on older WP (like v3.9.9) – you will get message: Contact Form 7 4.3.1 requires WordPress 4.2 or higher. Please update WordPress first.

    Note:
    – create, edit, display form on frontend = all working ok;
    – but when form is submitted – AJAX POST request will fail.

    What happens next depends on your server config:
    You either get a non-descriptic Error 500 or if you have Debug/Error logging enabled – you can see actual error instead of Error 500:

    Fatal error:  Call to undefined function wp_json_encode() in wp-content/plugins
/contact-form-7/includes/controller.php on line 97

    ..

    Solution:
    If updating to WP 4.1+ is not possible then:
    a) use older CF7 version;
    b) or you can just add missing functions using a fix plugin:

    You will need to copy 3 functions from: wordpress-4.1.8.zip/wordpress/wp-includes/functions.php

    wp_json_encode
_wp_json_sanity_check
_wp_json_convert_string

    Sample plugin:
    https://pastebin.com/urhmsP9k

Viewing 3 replies - 1 through 3 (of 3 total)
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