Use a heredoc:
$this->output(<<<EOF
<script> (function() {
var cx = '011900192141920744246:n9jj1rxodww';
var gcse = document.createElement('script');
gcse.type="text/javascript";
gcse.async = true;
gcse.src = (document.location.protocol == 'https:' ? 'https:' : 'http:') +
'//www.google.com/cse/cse.js?cx=' + cx;
var s = document.getElementsByTagName('script')[0];
s.parentNode.insertBefore(gcse, s);
})();
</script>
<gcse:search></gcse:search>
EOF
);
If this doesn’t work, check your output function.
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solved how to output google script with php