Warning call_user_func_array() – how to fix?

  • I have this error:

    Warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, ‘mc_script’ was given in /home5/optimal9/public_html/wp-includes/plugin.php

    It’s probably being caused by my new script in functions.php.

    It’s based on an Art Of Blog post about customizing a Mailchimp Signup Form (https://www.artofblog.com/styling-a-mailchimp-form/)

    I don’t know what is causing this error — the script works just fine. But I need to fix whatever’s causing the warning because users can see it.

    Here is the functions.php function I added:

    //add mailchimp scripts before body close
function mailchimp_scripts() { ?>
<script type="text/javascript">
var mc_custom_error_style = '';
</script>
<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.2.6/jquery.min.js"></script>
<script type="text/javascript" src="https://downloads.mailchimp.com/js/jquery.validate.js"></script>
<script type="text/javascript" src="https://downloads.mailchimp.com/js/jquery.form.js"></script>
<script type="text/javascript">
var fnames = new Array();var ftypes = new Array();fnames[0]='EMAIL';ftypes[0]='email';fnames[1]='FNAME';ftypes[1]='text';fnames[2]='LNAME';ftypes[2]='text';
try {
    var jqueryLoaded=jQuery;
    jqueryLoaded=true;
} catch(err) {
    var jqueryLoaded=false;
}
var head= document.getElementsByTagName('head')[0];
if (!jqueryLoaded) {
    var script = document.createElement('script');
    script.type = 'text/javascript';
    script.src = 'https://ajax.googleapis.com/ajax/libs/jquery/1.4.4/jquery.min.js';
    head.appendChild(script);
    if (script.readyState && script.onload!==null){
        script.onreadystatechange= function () {
              if (this.readyState == 'complete') mce_preload_check();
        }
    }
}
var script = document.createElement('script');
script.type = 'text/javascript';
script.src = 'https://downloads.mailchimp.com/js/jquery.form-n-validate.js';
head.appendChild(script);
var err_style = '';
try{
    err_style = mc_custom_error_style;
} catch(e){
    err_style = 'margin: 1em 0 0 0; padding: 1em 0.5em 0.5em 0.5em; background: ERROR_BGCOLOR none repeat scroll 0% 0%; font-weight: bold; float: left; z-index: 1; width: 80%; -moz-background-clip: -moz-initial; -moz-background-origin: -moz-initial; -moz-background-inline-policy: -moz-initial; color: ERROR_COLOR;';
}
var head= document.getElementsByTagName('head')[0];
var style= document.createElement('style');
style.type= 'text/css';
if (style.styleSheet) {
  style.styleSheet.cssText = '.mce_inline_error {' + err_style + '}';
} else {
  style.appendChild(document.createTextNode('.mce_inline_error {' + err_style + '}'));
}
head.appendChild(style);
setTimeout('mce_preload_check();', 250);

var mce_preload_checks = 0;
function mce_preload_check(){
    if (mce_preload_checks>40) return;
    mce_preload_checks++;
    try {
        var jqueryLoaded=jQuery;
    } catch(err) {
        setTimeout('mce_preload_check();', 250);
        return;
    }
    try {
        var validatorLoaded=jQuery("#fake-form").validate({});
    } catch(err) {
        setTimeout('mce_preload_check();', 250);
        return;
    }
    mce_init_form();
}
function mce_init_form(){
    jQuery(document).ready( function($) {
      var options = { errorClass: 'mce_inline_error', errorElement: 'div', onkeyup: function(){}, onfocusout:function(){}, onblur:function(){}  };
      var mce_validator = $("#mc-embedded-subscribe-form").validate(options);
      $("#mc-embedded-subscribe-form").unbind('submit');//remove the validator so we can get into beforeSubmit on the ajaxform, which then calls the validator
      options = { url: 'https://optimalwellnessctr.us2.list-manage.com/subscribe/post-json?u=9a44e161628c147fa7dbd983e&id=dc92b30340&c=?', type: 'GET', dataType: 'json', contentType: "application/json; charset=utf-8",
                    beforeSubmit: function(){
                        $('#mce_tmp_error_msg').remove();
                        $('.datefield','#mc_embed_signup').each(
                            function(){
                                var txt = 'filled';
                                var fields = new Array();
                                var i = 0;
                                $(':text', this).each(
                                    function(){
                                        fields[i] = this;
                                        i++;
                                    });
                                $(':hidden', this).each(
                                    function(){
                                        var bday = false;
                                        if (fields.length == 2){
                                            bday = true;
                                            fields[2] = {'value':1970};//trick birthdays into having years
                                        }
                                    	if ( fields[0].value=='MM' && fields[1].value=='DD' && (fields[2].value=='YYYY' || (bday && fields[2].value==1970) ) ){
                                    		this.value = '';
									    } else if ( fields[0].value=='' && fields[1].value=='' && (fields[2].value=='' || (bday && fields[2].value==1970) ) ){
                                    		this.value = '';
									    } else {
	                                        this.value = fields[0].value+'/'+fields[1].value+'/'+fields[2].value;
	                                    }
                                    });
                            });
                        return mce_validator.form();
                    },
                    success: mce_success_cb
                };
      $('#mc-embedded-subscribe-form').ajaxForm(options);      

    });
}
function mce_success_cb(resp){
    $('#mce-success-response').hide();
    $('#mce-error-response').hide();
    if (resp.result=="success"){
        $('#mce-'+resp.result+'-response').show();
        $('#mce-'+resp.result+'-response').html(resp.msg);
        $('#mc-embedded-subscribe-form').each(function(){
            this.reset();
    	});
    } else {
        var index = -1;
        var msg;
        try {
            var parts = resp.msg.split(' - ',2);
            if (parts[1]==undefined){
                msg = resp.msg;
            } else {
                i = parseInt(parts[0]);
                if (i.toString() == parts[0]){
                    index = parts[0];
                    msg = parts[1];
                } else {
                    index = -1;
                    msg = resp.msg;
                }
            }
        } catch(e){
            index = -1;
            msg = resp.msg;
        }
        try{
            if (index== -1){
                $('#mce-'+resp.result+'-response').show();
                $('#mce-'+resp.result+'-response').html(msg);
            } else {
                err_id = 'mce_tmp_error_msg';
                html = '<div id="'+err_id+'" style="'+err_style+'"> '+msg+'</div>';

                var input_id = '#mc_embed_signup';
                var f = $(input_id);
                if (ftypes[index]=='address'){
                    input_id = '#mce-'+fnames[index]+'-addr1';
                    f = $(input_id).parent().parent().get(0);
                } else if (ftypes[index]=='date'){
                    input_id = '#mce-'+fnames[index]+'-month';
                    f = $(input_id).parent().parent().get(0);
                } else {
                    input_id = '#mce-'+fnames[index];
                    f = $().parent(input_id).get(0);
                }
                if (f){
                    $(f).append(html);
                    $(input_id).focus();
                } else {
                    $('#mce-'+resp.result+'-response').show();
                    $('#mce-'+resp.result+'-response').html(msg);
                }
            }
        } catch(e){
            $('#mce-'+resp.result+'-response').show();
            $('#mce-'+resp.result+'-response').html(msg);
        }
    }
}

</script>
<?php }
add_action('thematic_after', 'mc_script');
// end mailchimp scripts
//
// add mailchimp signup div
function my_signup_div() {?>
<div class="signup-form">
<form action="https://optimalwellnessctr.us2.list-manage2.com/subscribe/post?u=9a44e161628c147fa7dbd983e&id=dc92b30340" method="post" id="mc-embedded-subscribe-form" name="mc-embedded-subscribe-form" class="validate" target="_blank">
    <input type="text" value="Enter Email Address" name="EMAIL" class="form_field"onblur="if (this.value == '') {this.value = 'Email Address';}" onfocus="if (this.value == 'Enter Email Address') {this.value = '';}"/>  <span style="font-weight: bold; color: #feebcf;">&laquo; Newsletter </span>
    <div class="signup-deets">
    <input type="text" value="First Name" name="FNAME" class="form_field" onblur="if (this.value == '') {this.value = 'First Name';}" onfocus="if (this.value == 'First Name') {this.value = '';}"/>
    <input type="submit" value="Get Started!" name="subscribe" class="form_button" tabindex=3 />
</form>
    <h3>Receive our Optimal Wellness Update about once per month.  Free.  I'll share my latest insights to help you feel and live better.  <br /><br />Your address is kept strictly private.</h3>
    </div>
</div>
<?php }
add_action('thematic_header','my_signup_div', 5);
// end add mailchimp signup div

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