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You need to do this on the load value hook for the repeater
example:
add_filter('acf/load_value/name=your-repeater-field-here', 'preload_repeater', 20, 3);
function preload_repeater($value, $post_id, $field) {
if (!empty($value)) {
// this repeater already has a value do not change it
return $value
}
// code here to populate repeater
// this is an example of what ACF is expecting for the value
// the repeater value is an array
$value= array(
// each row is a nested array
array(
// each nested row array is made up of "field key" => "value pairs"
'field_012345' => 'value for this sub field',
'field_123456' => 'value for 2nd sub field',
// etc....
),
// second row
array(
// etc...
),
// etc...
);
return $value;
}
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