I have a lottery search form which concatenate six input fields into a single value and returns the ticket results based on the position. My form works correctly for numbers 1-9, but it is unable to display results when I search for 0.
I believe this is because within my get_numbers() function, the value of '0' is being treated as empty: https://www.php.net/manual/en/function.empty.php
How can I fix my if else statement to stop it treating 0 as empty?
add_filter('wp_ajax_nopriv_get_numbers', 'get_numbers', 10);
add_filter('wp_ajax_get_numbers', 'get_numbers', 10);
function get_numbers(){
$str = '';
if(!empty($_POST['n_1'])){
$str .= $_POST['n_1'];
}else{
$str .= '.';
}
if(!empty($_POST['n_2'])){
$str .= $_POST['n_2'];
}else{
$str .= '.';
}
if(!empty($_POST['n_3'])){
$str .= $_POST['n_3'];
}else{
$str .= '.';
}
if(!empty($_POST['n_4'])){
$str .= $_POST['n_4'];
}else{
$str .= '.';
}
if(!empty($_POST['n_5'])){
$str .= $_POST['n_5'];
}else{
$str .= '.';
}
if(!empty($_POST['n_6'])){
$str .= $_POST['n_6'];
}else{
$str .= '.';
}
$atts = array(
'numberposts' => -1,
'posts_per_page' => -1,
'post_type' => 'product',
'meta_query' => array(
array(
'key' => 'product_overlay_text',
'value' => $str,
'compare' => 'REGEXP',
),
),
);
$the_query = new WP_Query( $atts );
ob_start();
if($the_query->have_posts()) :
woocommerce_product_loop_start();
while($the_query->have_posts()) : $the_query->the_post();
wc_get_template_part( 'content', 'product' );
endwhile;
woocommerce_product_loop_end();
$content['tickets_data'] = ob_get_clean();
else:
$content['tickets_data'] = 'เลขที่ท่านต้องการไม่มีในแผง';
endif;
You're correct that empty() returns TRUE for 0.
You could instead use filter_input() with the FILTER_VALIDATE_INT filter applied.
You could even simplify the whole thing with a range map...
$str = implode("", array_map(function($i) {
$val = filter_input(
INPUT_POST,
"n_$i",
FILTER_VALIDATE_INT
);
return $val === null || $val === false
? '.'
: $val;
}, range(1, 6)));