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PHP Operators and Expressions

PHP Operators and Expressions
In order to find if a variable holds an actual number or a string containing characters that can be translated into a number you can use:

is_num()
if_numeric
is_numeric()
is_number()

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PHP Operators and Expressions
What will be the output of the following PHP code ?
$x = 0;
function fun() {
echo $GLOBALS['x'];
$x++;
}
fun();
fun();
fun();

012
Error
000
Nothing

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

0
True
Nothing
Error

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PHP Operators and Expressions
Ceil(-2.1) would be

-2
2
3
-3

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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
red green
red
error

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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;
}

3
2
no output
1

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