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PHP Operators and Expressions

PHP Operators and Expressions
What will be the output of the following PHP code ?
$color1 = "red";
$color2 = "1";
echo "$color1" + "$color2";

0
1
red 1
red1

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PHP Operators and Expressions
What will be the output of the following PHP code ?
$color = "red";
echo "$color";
echo "$COLOR";
echo "$Color";

redredred
redred
red
Error

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PHP Operators and Expressions
What will be the output of the following PHP code ?
$auth = 1;
$status = 1;
if ($result = (($auth == 1) && ($status != 0))) {
print "result is $result";
}

no output
result is 1
result is true
error

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

6
error
7
5

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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()
is_number()
if_numeric
is_numeric()

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

1
0
no output
2

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