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Give each Gravity Forms entry a unique ID
/* Put a unique ID on Gravity Form (single form ID) entries.
add_filter("gform_field_value_uuid", "get_unique");
function get_unique(){
$prefix = "SLP2017-"; // update the prefix here
do {
$unique = mt_rand();
$unique = substr($unique, 0, 8);
$unique = $prefix . $unique;
} while (!check_unique($unique));
return $unique;
function check_unique($unique) {
global $wpdb;
$table = $wpdb->prefix . 'rg_lead_detail';
$form_id = 3; // update to the form ID your unique id field belongs to
$field_id = 7; // update to the field ID your unique id is being prepopulated in
$result = $wpdb->get_var("SELECT value FROM $table WHERE form_id = '$form_id' AND field_number = '$field_id' AND value = '$unique'");
return true;
return false;
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