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PHP Operators and Expressions

PHP Operators and Expressions
What will be the output of the following PHP code ?
print_r "Hello world"

Hello World
Error
Nothing
Missing semicolon error

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PHP Operators and Expressions
What will be the output of the following PHP code ?
$x = 5;
$y = 10;
$z = "$x + $y";
echo "$z";

10 + 5
$x + $y
15
$z

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PHP Operators and Expressions
What will be the output of the following PHP code ?
$x = "test";
$y = "this";
$z = "also";
$x .= $y .= $z ;
echo $x;
echo $y;

testthisalsothisalso
testthis
error at line 4
testthisthisalso

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PHP Operators and Expressions
What will be the output of the following PHP code ?
$y = 2;
$w = 4;
$y *= $w /= $y;
echo $y, $w;

80.5
82
42
44

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PHP Operators and Expressions
What will be the output of the following PHP code ?
echo $x-- != ++$x;

error
0
1
no output

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PHP Operators and Expressions
What will be the output of the following PHP code ?
$color1 = "red";
$color2 = "green";
echo "$color1" . "$color2";

green
redgreen
red green
red

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