011 - comparison operations (result always true and false, if true print 1, for false, nothing)==1==1========1!=1<><>><>=1<=1<=>0<=>1<=>-1
<?php
// 011 - comparison operations (result always true and false, if true print 1, for false, nothing)
echo "</br><span class='myheading'>011 - comparison operations (result always true and false, if true print 1, for false, nothing)</span></br>";
$a = 10;
$b = 10;
$c = 3;
$d = "rajat";
$e = 3;
$f = 3;
$g = 4;
$h = 2;
$i = 3;
$j = 3;
$k = 3;
$l = 13;
echo "==" .( $a == $b ) . "</br>"; // if a equals to b
echo "==" .( $a == $b ) . "</br>"; // won't work
echo "==" .( $a == $c ). "</br>"; //value must be equal
echo "===" .( $c === $d ) . "</br>"; //value and data type must be equal
echo "===" .( $c === $e ) . "</br>"; //value and data type must be equal
echo "!=". ( $a != $c ) . "</br>"; // not equal to
echo "<>". ( $a <> $b ) . "</br>"; // not equalt to
echo "<>". ( $a !== $b ) . "</br>"; // data type and value , both not equal to
echo ">". ( $a > $b) . "</br>";
echo "<". ( $a < $b) . "</br>";
echo ">=". ( $a >= $b) . "</br>";
echo "<=". ( $a <= $b) . "</br>";
echo "<=>". ( $a <=> $b) . "</br>"; //Spaceship (-1,0,1) check less than, greater than & equal to ,php 7
echo "<=>". ( $a <=> $c) . "</br>"; //Spaceship (-1,0,1)
echo "<=>". ( $a <=> $l) . "</br>"; //Spaceship (-1,0,1)
?>