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PHP Operators and Expressions

PHP Operators and Expressions
What will be the output of the following PHP code ?
define('IF', 42);
echo "IF: ", IF;

IF:42
No output
ERROR
IF:

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

red
error
nothing
red red

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PHP Operators and Expressions
What will be the output of the following PHP code ?
$a = 10;
$b = 10;
if ($a = 5)
$b--;
print $a;
print $b--;

108
58
59
109

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PHP Operators and Expressions
What will be the output of the following PHP code ?
$i = 5;
while (--$i > 0) {
$i++;
print $i;
print "hello";
}

5hello5hello5hello5hello5hello…..infinite
error
no output
4hello4hello4hello4hello4hello…..infinite

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

Hello world
Error
echo Hello world
echo “Hello world”

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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_number()
is_numeric()
if_numeric
is_num()

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