<?php
// How many to add
$response_count=3;
// Your response, just templated
$response_template=array( 'response_number'=>0,
'ackNo'=>'dffdgd',
'repairStatus'=>'$repairStatus',
'savedAt'=>'$savedAt'
);
// Your empty response array
for($i=0;$i<$response_count;$i++) {
$response_template['response_number'] = $i; // Set the 'response number' to the itteration.
$response[]= $response_template; // Add the template to the collection
}
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[{"response_number":0,"ackNo":"dffdgd","repairStatus":"$repairStatus","savedAt":"$savedAt"},{"response_number":1,"ackNo":"dffdgd","repairStatus":"$repairStatus","savedAt":"$savedAt"},{"response_number":2,"ackNo":"dffdgd","repairStatus":"$repairStatus","savedAt":"$savedAt"}]