Recursion error in json_encode() when accessing Customizer

[thegaer]

I have updated my site to latest wordpress version 4.1 .When i tried to customize my theme it is generating error.

Warning</b>: json_encode() [<a href='function.json-encode'>function.json-encode</a>]: recursion detected in <b>/var/sites/t/thegaer.org.uk/public_html/wp-includes/functions.php</b> on line <b>2663</b><br />

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<b>Warning</b>: json_encode() [<a href='function.json-encode'>function.json-encode</a>]: recursion detected in <b>/var/sites/t/thegaer.org.uk/public_html/wp-includes/functions.php</b> on line <b>2663</b><br />
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<b>Warning</b>: json_encode() [<a href='function.json-encode'>function.json-encode</a>]: recursion detected in <b>/var/sites/t/thegaer.org.uk/public_html/wp-includes/functions.php</b> on line <b>2663</b><br />
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<b>Warning</b>: json_encode() [<a href='function.json-encode'>function.json-encode</a>]: recursion detected in <b>/var/sites/t/thegaer.org.uk/public_html/wp-includes/functions.php</b> on line <b>2663</b><br />

[thegaer]

Error File

[westonruter]

What version of PHP is running on your host? The json_encode() function was introduced in PHP 5.2, and WordPress requires PHP 5.2+.

[westonruter]

I just noticed the error was regarding recursion and not that json_encode() is not defined.

It sounds like a plugin or theme may be misbehaving. Does the problem happen with another theme, or with plugins turned off?

[SergeyBiryukov]

Previously: #27852

[thegaer]

Replying to westonruter:

I just noticed the error was regarding recursion and not that json_encode() is not defined.

It sounds like a plugin or theme may be misbehaving. Does the problem happen with another theme, or with plugins turned off?

I am unable to download any plugin to check my php version (not compatible).how do i check my php version.
Please guide me on how to revert the changes and go back to previous version of wordpress.

[westonruter]

Here's a way you can disable plugins manually: ​http://www.wpbeginner.com/plugins/how-to-deactivate-all-plugins-when-not-able-to-access-wp-admin/

I suspect this ticket should soon move to support forums and not be in Trac.