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PHP Operators and Expressions

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

1
Nothing
0
Error

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PHP Operators and Expressions
What will be the output of the following PHP code ?
$var1 = 1 + ++5;
echo $var1;

error
7
no output
6

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

Error
Nothing
Hello World
Missing semicolon error

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PHP Operators and Expressions
What will be the output of the following PHP code ?
define("GREETING", "PHP is a scripting language");
echo $GREETING;

no output
GREETING
PHP is a scripting language
$GREETING

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PHP Operators and Expressions
What will be the output of the following PHP code ?
echo "This", "was", "a", "bad", "idea";

This, was, a, bad, idea
This was a bad idea
Thiswasabadidea
Error

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PHP Operators and Expressions
What will be the output of the following PHP code ?
$i = "";
while ($i = 10) {
print "hi";
}
print "hello";

hello
error
hihello
infinite loop

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