php - Radio Buttons not showing up as checked -

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i'm trying write theme options page wordpress. in it, user select alignment of div through radio buttons.

currently looks when option selected: https://gyazo.com/e27c2fc2c2e1f751ab27d98453581c52

i wondering how i'd fix (for radio buttons show checked , not checked='checked'center). works , correctly outputs front-end doesn't show checked without checked='checked'. if use jquery remove checked='checked' removes radio buttons together.

register_setting('slider_setting','slider_section1_direction'); add_settings_section( 'slider_section', '', 'slider_settings_callback', 'register_slider_settings' ); add_settings_field( 'slider_section1_direction', '', 'slider_section1_direction_callback', 'register_slider_settings', 'slider_section' );   function slider_section1_radio_buttons_callback() {     $s1_radio_buttons_settings = array(       'left' => array(           'value' => 'left',           'label' => 'left'         ),       'center' => array(           'value' => 'center',           'label' => 'center'         ),       'right' => array(           'value' => 'right',           'label' => 'right'         ),     );    return apply_filters( 'slider_section1_radio_buttons_callback', $s1_radio_buttons_settings );   }    function slider_section1_direction_callback() {     $settings = get_option('slider_section1_direction');     echo '<div class="setting">';     echo '<div class="setting-header half-width-header">';     esc_attr_e('slider text alignment');     echo '</div>';     echo '<div class="setting-body" style="margin-top: 5px">';      // radio buttons     foreach ( slider_section1_radio_buttons_callback() $s1_button ) {       echo '<label class="description" style="margin-right: 40px">';         echo "<input type='radio'" . checked( $settings['s1_radio_buttons_settings'], $s1_button['value'] ) . " name='slider_section1_direction[s1_radio_buttons_settings]' value='" . esc_attr( $s1_button['value'] ) . "'/>";         echo $s1_button['label'];       echo '</label>';     }      echo '</div>';     echo '<div class="clear"></div>';     echo '</div>';   }   function slider_settings_callback() {      }

thanks!

i checked documentation checked function, , looks echos checked="checked" attribute. however, because want concatenate string, want return attribute instead. luckily third parameter in function can set false cause function return attribute instead. change usage of function this:

checked( $settings['s1_radio_buttons_settings'], $s1_button['value'], false)

notice false @ end of function.


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