{"id":395,"date":"2016-03-05T18:27:27","date_gmt":"2016-03-05T18:27:27","guid":{"rendered":"http:\/\/blog.trungson.com\/?p=395"},"modified":"2016-03-05T18:27:27","modified_gmt":"2016-03-05T18:27:27","slug":"optimization-foreach-empty-array","status":"publish","type":"post","link":"http:\/\/blog.trungson.com\/?p=395","title":{"rendered":"Optimization with foreach() an empty array"},"content":{"rendered":"

<?php
\n$vResult = array();
\n$vAry = array(‘abc’);
\n$vLimit = 10000000;<\/p>\n

$vStart = microtime(true);
\nfor ($i=1;$i<$vLimit; $i++) {
\nforeach ($vAry as $a) {}
\n} \/\/ rof
\n$vResult[] = “NoEmptyCheck= “.(microtime(true)-$vStart);<\/p>\n

$vStart = microtime(true);
\nfor ($i=1;$i<$vLimit; $i++) {
\nif (!empty($vAry)) {
\nforeach ($vAry as $a) {}
\n}
\n} \/\/ rof
\n$vResult[] = “WithEmptyCheck= “.(microtime(true)-$vStart);<\/p>\n

echo implode(“\\n”,$vResult).”\\n”;<\/p>\n

\/* Result<\/p>\n

For an often-non-empty array scenario:
\nNoEmptyCheck= 2.10900402069
\nWithEmptyCheck= 2.59749412537<\/p>\n

For an often-empty array scenario:
\n– NoEmptyCheck= 1.08695101738
\n– WithEmptyCheck= 1.01621007919<\/p>\n

*\/<\/p>\n

?><\/p>\n","protected":false},"excerpt":{"rendered":"

<?php $vResult = array(); $vAry = array(‘abc’); $vLimit = 10000000; $vStart = microtime(true); for ($i=1;$i<$vLimit; $i++) { foreach ($vAry as $a) {} } \/\/ rof $vResult[] = “NoEmptyCheck= “.(microtime(true)-$vStart); $vStart = microtime(true); for ($i=1;$i<$vLimit; $i++) { if (!empty($vAry)) { foreach ($vAry as $a) {} } } \/\/ rof $vResult[] = “WithEmptyCheck= “.(microtime(true)-$vStart); echo implode(“\\n”,$vResult).”\\n”; \/* […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"_links":{"self":[{"href":"http:\/\/blog.trungson.com\/index.php?rest_route=\/wp\/v2\/posts\/395"}],"collection":[{"href":"http:\/\/blog.trungson.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/blog.trungson.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/blog.trungson.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/blog.trungson.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=395"}],"version-history":[{"count":1,"href":"http:\/\/blog.trungson.com\/index.php?rest_route=\/wp\/v2\/posts\/395\/revisions"}],"predecessor-version":[{"id":396,"href":"http:\/\/blog.trungson.com\/index.php?rest_route=\/wp\/v2\/posts\/395\/revisions\/396"}],"wp:attachment":[{"href":"http:\/\/blog.trungson.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=395"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/blog.trungson.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=395"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/blog.trungson.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=395"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}