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PHP Operators and Expressions

PHP Operators and Expressions
What will be the output of the following PHP code ?
$x = 1;
$y = 2;
if (++$x == $y++) {
echo "true ", $y, $x;
}

true 33
true 22
true 23
no output

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PHP Operators and Expressions
What will be the output of the following PHP code ?
$y = 2;
if ($y-- == ++$y) {
echo $y;
}

1
no output
2
3

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PHP Operators and Expressions
What will be the output of the following PHP code ?
define("NEW_GOOD_NAME_CONSTANT", "I have a value");
define("OLD_BAD_NAME_CONSTANT", NEW_GOOD_NAME_CONSTANT);
echo NEW_GOOD_NAME_CONSTANT;
echo OLD_BAD_NAME_CONSTANT;

I have a value
ERROR
I have a valueNEW_GOO_NAME_CONSTANTS
I have a valueI have a value

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PHP Operators and Expressions
What will be the output of the following PHP code ?
$one = "Hello";
$two = "World";
echo $one, $two;

World
Hello World
HelloWorld
Hello

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PHP Operators and Expressions
What will be the output of the following PHP code ?
$four4 = 4;
$three3 = 3;
$two2 = 2;
echo $four4 + $three3 / $two2 - 1;

Error
3.5
7
4.5

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PHP Operators and Expressions
What will be the output of the following PHP code ?
echo $red;

0
Error
True
Nothing

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