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<?php

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/**

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* Main Meks Time Ago plugin class.

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* This class loads plugin options, sets filters and converts the date on selected hooks.

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* @subpackage Frontend interfaces

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* @author Sibin Grasic

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* @since 1.0

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* @var opts - plugin options

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class Meks_TA_Frontend {

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private $opts;

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private $date_format;

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/**

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* Class Constructor

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* Loads default options, sets default filter list and adds convert_date filter to selected locations

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* @author Sibin Grasic

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* @since 1.0

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public function __construct() {

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$default_opts = array(

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'active' => array( 'date' => true, 'time' => true, 'modified_date' => false, 'modified_time' => false ),

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'position' => 'after',

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'time' => array( 'number' => '12', 'type' => 'months' ),

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'ago_label' => ''

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);

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$default_opts = apply_filters( 'meks_ta_modify_default_opts', $default_opts );

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$this->opts = get_option( 'meks_ta_opts', $default_opts );

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$this->opts = $this->parse_args( $this->opts, $default_opts);

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$filter_list = array();

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if ( $this->opts['active']['date'] ):

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$filter_list = array_merge( $filter_list, array( 'the_date', 'get_the_date' ) );

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endif;

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if ( $this->opts['active']['time'] ) :

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$filter_list = array_merge( $filter_list, array( 'get_the_time', 'the_time' ) );

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endif;

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if ( $this->opts['active']['modified_date'] ) :

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$filter_list = array_merge( $filter_list, array( 'get_the_modified_date', 'the_modified_date' ) );

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endif;

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if ( $this->opts['active']['modified_time'] ) :

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$filter_list = array_merge( $filter_list, array( 'get_the_modified_time', 'the_modified_time' ) );

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endif;

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/**

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* Filter the list of applicable filter locations

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* @since 1.0

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* @param array $filter_list List of filters for time appearance change

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$filters = apply_filters(

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'meks_ta_filters',

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$filter_list

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);

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foreach ( $filters as $filter ) :

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add_filter( $filter, array( &$this, 'convert_date' ), 10, 2 );

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endforeach;

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}

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/**

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* Main plugin function which does the date conversion.

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* If the plugin is not set as 'active', returns original time / date string.

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* If the plugin is active, gets the current time, as well as the post time and displays the custom string

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* @param $orig_time Original time / date string

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* @param $date_format Date format added as a param to get_the_date or any other WordPress funciton

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* @return string

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* @since 1.0

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public function convert_date( $orig_time, $date_format ) {

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$this->date_format = $date_format;

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if( !$this->can_convert_date() ){

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return $orig_time;

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}

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$time_arr = array(

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'minutes' => 60,

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'hours' => HOUR_IN_SECONDS,

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'days' => DAY_IN_SECONDS,

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'months' => YEAR_IN_SECONDS / 12,

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);

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//If option not set as active return original string.

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if ( !$this->opts['active'] ){

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return $orig_time;

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}

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$time = current_time( 'timestamp' );

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$limit = (int)$this->opts['time']['number'] * $time_arr[$this->opts['time']['type']] ;

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global $post;

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$post_time = strpos( current_filter(), 'modified' ) ? strtotime( $post->post_modified ) : strtotime( $post->post_date );

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if ( ( $time - $post_time ) <= $limit ) {

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$ago_label = !empty( $this->opts['ago_label'] ) ? $this->opts['ago_label'] : __( 'ago', 'meks-time-ago' );

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if ( $this->opts['position'] === 'after' ) {

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return human_time_diff( $post_time, $time ).' '.$ago_label;

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} else {

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return $ago_label.' '.human_time_diff( $post_time, $time );

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}

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}

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return $orig_time;

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}

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/**

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* Check compatibility

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* Check if there are plugins which may cause a conflict with our time ago functionality

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* For example: AMP WordPress plugin already has time ago functionality

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* @return bool

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* @since 1.1.1

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function can_convert_date(){

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return $this->is_amp() || !$this->is_valid_date_format() ? false : true;

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}

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/**

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* Check if date format has more then one placeholder

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* @return bool

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function is_valid_date_format(){

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if($this->date_format === ""){

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$this->date_format = get_option( 'date_format' );

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}

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$this->date_format = preg_replace('/[^\da-z]/i', '', $this->date_format);

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return strlen($this->date_format) >= 2;

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}

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/**

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* Prevent conflict with AMP plugin

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* @return bool

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* @since 1.1.4

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function is_amp(){

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return function_exists( 'is_amp_endpoint') && is_amp_endpoint();

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}

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/**

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* Parse args ( merge arrays )

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* Similar to wp_parse_args() but extended to also merge multidimensional arrays

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* @param array $a - set of values to merge

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* @param array $b - set of default values

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* @return array Merged set of elements

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* @since 1.1.3

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function parse_args( &$a, $b ) {

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$a = (array) $a;

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$b = (array) $b;

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$r = $b;

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foreach ( $a as $k => &$v ) {

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if ( is_array( $v ) && isset( $r[ $k ] ) ) {

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$r[ $k ] = $this->parse_args( $v, $r[ $k ] );

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} else {

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$r[ $k ] = $v;

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}

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}

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return $r;

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}

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}

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