checked() - Outputs the html checked attribute.

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Description

Outputs the html checked attribute.

Compares the first two arguments and if identical marks as checked

$string = checked( $checked, $current, $echo );

$checked: ( mixed ) required – One of the values to compare
$current: ( mixed ) optional default: 1 – (true) The other value to compare if not just true
$echo: ( bool ) optional default: 1 – Whether to echo or just return the string

string html attribute or empty string

File name: wordpress/wp-includes/general-template.php

Lines:

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function checked( $checked, $current = true, $echo = true ) {
  return __checked_selected_helper( $checked, $current, $echo, 'checked' );
}