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PHP Operators and Expressions

PHP Operators and Expressions
What will be the output of the following PHP code ?
$var1 = 0;
$var1 = ($var1 + 5)++;
echo $var1;

5
6
error
7

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PHP Operators and Expressions
What will be the output of the following PHP code ?
define("VAR_NAME","test");
${VAR_NAME} = "value";
echo VAR_NAME;
echo ${VAR_NAME};

error, constant value cannot be changed
testvalue
test
testtest

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

Hello world
Hello world# Hello world
# Hello world
Error

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PHP Operators and Expressions
What will be the output of the following PHP code ?
$a = 10;
echo ++$a;
echo $a++;
echo $a;
echo ++$a;

11111112
11121213
11111212
11111213

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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 ?
$i = 0;
while ((--$i > ++$i) - 1) {
print $i;
}

error
no output
00000000000000000000….infinitely
-1-1-1-1-1-1-1-1-1-1…infinitely

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