Question

How to use logical operators in PHP

Answer 1

function and_test($x, $y)
{
    $z = ($x && $y) ? "true" : "false"; // True if $x and $y are true  
    
    return $x . " and " . $y . " = " . $z . "<br />";    
}
echo and_test(1, 1);
echo and_test(1, 0);
echo and_test(0, 1);
echo and_test(0, 0);

// if ($x && $y)

echo "<br />";

function or_test($x, $y)
{
    $z = ($x || $y) ? "true" : "false"; // True if $x or $y is true
    
    return $x . " or " . $y . " = " . $z . "<br />"; 
}
echo or_test(1, 1);
echo or_test(1, 0);
echo or_test(0, 1);
echo or_test(0, 0);

// if ($x || $y)

echo "<br />";

function xor_test($x, $y)
{
    $z = ($x xor $y) ? "true" : "false"; // True if $x or $y is true, but not both
    
    return $x . " xor " . $y . " = " . $z . "<br />"; 
}
echo xor_test(1, 1);
echo xor_test(1, 0);
echo xor_test(0, 1);
echo xor_test(0, 0);

// if ($x xor $y)

echo "<br />";

function not_test($x)
{
    $z = (!$x) ? "true" : "false"; // True if $x is false
    
    return "!" . $x . " = " . $z . "<br />"; 
}

echo not_test(1);
echo not_test(0);

// if (!$x)

/*
run:

1 and 1 = true
1 and 0 = false
0 and 1 = false
0 and 0 = false

1 or 1 = true
1 or 0 = true
0 or 1 = true
0 or 0 = false

1 xor 1 = false
1 xor 0 = true
0 xor 1 = true
0 xor 0 = false

!1 = false
!0 = true

*/

 

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