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Wordpress: Warning: call_user_func_array() expects parameter 1 to be a valid callback, func
Wordpress: Warning: call_user_func_array() expects parameter 1 to be a valid callback
Warning: call_user_func_array() expects parameter 1 to be a valid callback, function...
Wordpress: WordPress call_user_func_array() expects parameter 1 to be a valid callback, class
Warning: call_user_func_array() expects parameter 1 to be a valid callback, function...
Wordpress: CPT issue: Warning: call_user_func_array() expects parameter 1 to be a valid callback
Warning: call_user_func_array() expects parameter 1 to be a valid callback, function...
Error call_user_func_array() expects parameter 1 to be a valid callback when using...
Wordpress: call_user_func_array expects parameter 1 to be a valid callback (2 Solutions!!)
Wordpress: call_user_func_array() expects parameter 1 to be a valid callback
Wordpress 4.9.5 PHP intermittent warning trim() expects parameter 1 to be string, array given
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Last Updated: August 23, 2026
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