------------------------------
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------------------------------

$a = 0; evZero($a, a);
$b = '0'; evZero($b, b);
$c = "0"; evZero($c, c);
$d = null; evZero($d, d);
$e = 'null'; evZero($e, e);
$f = "null"; evZero($f, f);

function evZero($val, $str){
	print $str . "------ \n
";
	
	if($val==0){
		print $str . '==0' . "\n
";
	}
	if($val=='0'){
		print $str . "=='0'" . "\n
";
	}
	if($val=="0"){
		print $str . '=="0"' . "\n
";
	}
	if($val===0){
		print $str . '===0' . "\n
";
	}
	if($val==='0'){
		print $str . "==='0'" . "\n
";
	}
	if($val==="0"){
		print $str . '==="0"' . "\n
";
	}
	if($val==null){
		print $str . '==null' . "\n
";
	}
	if($val=='null'){
		print $str . "=='null'" . "\n
";
	}
	if($val=="null"){
		print $str . '=="null"' . "\n
";
	}
	if($val===null){
		print $str . '===null' . "\n
";
	}
	if($val==='null'){
		print $str . "==='null'" . "\n
";
	}
	if($val==="null"){
		print $str . '==="null"' . "\n
";
	}
	if(is_null($val)){
		print $str . ' is_null' . "\n
";
	} else {
		print $str . ' is not _null' . "\n
";
	}
	if($val!=0){
		print $str . '!=0' . "\n
";
	}
	if($val!='0'){
		print $str . "!='0'" . "\n
";
	}
	if($val!="0"){
		print $str . '!="0"' . "\n
";
	}
	if($val!==0){
		print $str . '!==0' . "\n
";
	}
	if($val!=='0'){
		print $str . "!=='0'" . "\n
";
	}
	if($val!=="0"){
		print $str . '!=="0"' . "\n
";
	}
	if($val!=null){
		print $str . '!=null' . "\n
";
	}
	if($val!='null'){
		print $str . "!='null'" . "\n
";
	}
	if($val!="null"){
		print $str . '!="null"' . "\n
";
	}
	if($val!==null){
		print $str . '!==null' . "\n
";
	}
	if($val!=='null'){
		print $str . "!=='null'" . "\n
";
	}
	if($val!=="null"){
		print $str . '!=="null"' . "\n
";
	}
	if(!is_null($val)){
		print $str . '!is_null' . "\n
";
	} else {
		print $str . ' !is not _null' . "\n
";
	}
	if($val==all){
		print $str . '==all' . "\n
";
	}
	if($val=='all'){
		print $str . "=='all'" . "\n
";
	}
	if($val=="all"){
		print $str . '=="all"' . "\n
";
	}
	if($val===all){
		print $str . '===all' . "\n
";
	}
	if($val==='all'){
		print $str . "==='all'" . "\n
";
	}
	if($val==="all"){
		print $str . '==="all"' . "\n
";
	}
	if($val==1){
		print $str . '==1' . "\n
";
	}
	if($val=='1'){
		print $str . "=='1'" . "\n
";
	}
	if($val=="1"){
		print $str . '=="1"' . "\n
";
	}
	if($val===1){
		print $str . '===1' . "\n
";
	}
	if($val==='1'){
		print $str . "==='1'" . "\n
";
	}
	if($val==="1"){
		print $str . '==="1"' . "\n
";
	}
	if($val!=1){
		print $str . '!=1' . "\n
";
	}
	if($val!='1'){
		print $str . "!='1'" . "\n
";
	}
	if($val!="1"){
		print $str . '!="1"' . "\n
";
	}
	if($val!==1){
		print $str . '!==1' . "\n
";
	}
	if($val!=='1'){
		print $str . "!=='1'" . "\n
";
	}
	if($val!=="1"){
		print $str . '!=="1"' . "\n
";
	}
	if($val==zzz){
		print $str . '==zzz' . "\n
";
	}
	if($val=='zzz'){
		print $str . "=='zzz'" . "\n
";
	}
	if($val=="zzz"){
		print $str . '=="zzz"' . "\n
";
	}
	if($val===zzz){
		print $str . '===zzz' . "\n
";
	}
	if($val==='zzz'){
		print $str . "==='zzz'" . "\n
";
	}
	if($val==="zzz"){
		print $str . '==="zzz"' . "\n
";
	}
	if($val != 'flag'){
		print $str . "!='flag' true" . "\n
";
	} else {
		print $str . "!='flag' false" . "\n
";
	}
	if($val !== 'flag'){
		print $str . "!=='flag' true" . "\n
";
	} else {
		print $str . "!=='flag' false" . "\n
";
	}
	if($val){
		print 'if(' . $str . ") true \n
";
	} else {
		print 'if(' . $str . ") false \n
";
	}
	print "\n
";
}