Upgrade to PHP7.2 causes memory issues - php

Question

My hosting provided upgraded to PHP7.2 and now I started to receive a lot of issues. As my Wordpress theme builder does no longer exist I went through the issues myself fixing problems. For some reason this does not go away and I'm worried about it.
Fatal error: Allowed memory size of 1048576000 bytes exhausted (tried
to allocate 20480 bytes) in
/customers/3/8/4/XXX/httpd.www/wp-content/themes/dejavu/lib/classes/widget-popular.php
on line 14
Whenever I increase the limit in wp-config it just keeps growing. Is the problem in that php file or should I look somewhere else? Content of that php file:
<?php
/**
*
*/
class MySite_PopularPost_Widget extends WP_Widget {
/**
*
*/
function __construct() {
$widget_ops = array( 'classname' => 'mysite_popular_widget', 'description' => __( 'Custom popular post widget with post preview image', MYSITE_ADMIN_TEXTDOMAIN ) );
$control_ops = array( 'width' => 250, 'height' => 200 );
$this->__construct( 'popularwidget', sprintf( __( '%1$s - Popular Post', MYSITE_ADMIN_TEXTDOMAIN ), THEME_NAME ), $widget_ops, $control_ops );
}
/**
*
*/
function widget($args, $instance) {
global $wpdb, $mysite;
$prefix = MYSITE_PREFIX;
extract( $args );
$title = apply_filters('widget_title', empty($instance['title']) ? __('Popular Posts') : $instance['title'], $instance, $this->id_base);
if ( !$number = (int) $instance['number'] )
$number = 3;
else if ( $number < 1 )
$number = 1;
else if ( $number > 15 )
$number = 15;
echo $before_widget;
echo $before_title . $title . $after_title;
$count = ( !empty( $count ) ) ? trim( $count ) : '3';
$disable_thumb = $instance['disable_thumb'] ? '1' : '0';
$popular_query = new WP_Query(array(
'showposts' => $number,
'nopaging' => 0,
'orderby'=> 'comment_count',
'post_status' => 'publish',
'category__not_in' => array( mysite_exclude_category_string( $minus = false )),
'ignore_sticky_posts' => 1
));
$out = '<ul class="post_list small_post_list">';
while ( $popular_query->have_posts() ) {
$popular_query->the_post();
$out .= '<li class="post_list_module">';
if( !$disable_thumb ) {
$widget_thumb_img = $mysite->layout['big_sidebar_images']['small_post_list'];
$out .= mysite_get_post_image(array(
'width' => $widget_thumb_img[0],
'height' => $widget_thumb_img[1],
'img_class' => 'post_list_image',
'preload' => false,
'placeholder' => true,
'echo' => false,
'wp_resize' => ( mysite_get_setting( 'image_resize_type' ) == 'wordpress' ? true : false )
));
}
$out .= '<div class="post_list_content">';
$out .= '<p class="post_title">';
$out .= '<a rel="bookmark" href="' . esc_url( get_permalink() ) . '" title="' . esc_attr( get_the_title() ) . '">' . get_the_title() . '</a>';
$out .= '</p>';
$get_year = get_the_time( 'Y', get_the_ID() );
$get_month = get_the_time( 'm', get_the_ID() );
$out .= '<p class="post_meta">';
$out .= apply_filters( 'mysite_widget_meta', do_shortcode( '[post_date]' ) );
$out .= '</p>';
$out .= '</div>';
$out .= '</li>';
}
$out .= '</ul>';
echo $out;
echo $after_widget;
wp_reset_postdata();
}
/**
*
*/
function update($new_instance, $old_instance) {
$instance = $old_instance;
$instance['title'] = strip_tags($new_instance['title']);
$instance['number'] = (int) $new_instance['number'];
$instance['disable_thumb'] = !empty($new_instance['disable_thumb']) ? 1 : 0;
return $instance;
}
/**
*
*/
function form($instance) {
$title = isset($instance['title']) ? esc_attr($instance['title']) : '';
$disable_thumb = isset( $instance['disable_thumb'] ) ? (bool) $instance['disable_thumb'] : false;
if ( !isset($instance['number']) || !$number = (int) $instance['number'] )
$number = 3;
?>
<p><label for="<?php echo $this->get_field_id('title'); ?>"><?php _e( 'Title:', MYSITE_ADMIN_TEXTDOMAIN ); ?></label>
<input class="widefat" id="<?php echo $this->get_field_id('title'); ?>" name="<?php echo $this->get_field_name('title'); ?>" type="text" value="<?php echo $title; ?>" /></p>
<p><label for="<?php echo $this->get_field_id('number'); ?>"><?php _e( "Enter the number of popular posts you'd like to display:", MYSITE_ADMIN_TEXTDOMAIN ); ?></label>
<input class="widefat" id="<?php echo $this->get_field_id('number'); ?>" name="<?php echo $this->get_field_name('number'); ?>" type="text" value="<?php echo $number; ?>" /></p>
<input type="checkbox" class="checkbox" id="<?php echo $this->get_field_id('disable_thumb'); ?>" name="<?php echo $this->get_field_name('disable_thumb'); ?>"<?php checked( $disable_thumb ); ?> />
<label for="<?php echo $this->get_field_id('disable_thumb'); ?>"><?php _e( 'Disable Post Thumbnail?', MYSITE_ADMIN_TEXTDOMAIN ); ?></label></p>
<?php
}
}
?>