json - Unlink file in PHP, then create new one with file_put_contents -

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i trying use file_put_contents put json file in place, finding not overwrite existing file. thinking @ point try , unlink pre-existing file first, , user file_put_contents create new one. reason, not seem working. have feeling 2 operations happening quickly, , second step tries run before first step completes. here code:

$filename = '<?php echo site_url() ?>js/salecomps.json'; if (is_readable($filename)) {     chmod($filename, 0777);          unlink($filename); }  $q = $this->db->query("select rollnum , address, v2_lat, v2_lng  tblontario municipality = 'ajax' limit 100");            $json_string = json_encode($q->result(), json_pretty_print); file_put_contents('<?php echo site_url() ?>js/salecomps.json', $json_string);

please tell me doing wrong. thanks.

you using wrong way include <?php echo site_url()?> not give filepath try change

$filename = '<?php echo site_url() ?>js/salecomps.json'; file_put_contents('<?php echo site_url() ?>js/salecomps.json', $json_string);

to

 $filename = site_url().'js/salecomps.json';  file_put_contents(site_url().'js/salecomps.json', $json_string);

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