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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";
$color3 = "grey";
echo "$color1" + "$color2" . "$color3";

0
1grey
grey
red1grey

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PHP Operators and Expressions
What will be the output of the following PHP code ?

Hello World
Nothing
Error
Missing semicolon error

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PHP Operators and Expressions
What will be the output of the following PHP code ?
$a = 10;
$b = 4;
$c = fun(10,4);
function fun($a,$b) {
$b = 3;
return $a - $b + $b - $a;
}
echo $a;
echo $b;
echo $c;

104
1400
4100
410

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PHP Operators and Expressions
What will be the output of the following PHP code ?
$x = 4;
$y = 3;
function fun($x = 3, $y = 4) {
$z = $x+$y/$y+$x;
echo "$z";
}
echo $x;
echo $y;
echo $z;
fun($x, $y);

43
439
349
943

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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 ?
$i = 2;
while (++$i) {
while ($i --> 0)
print $i;
}

no output
infinite loop
10
210

ANSWER DOWNLOAD EXAMIANS APP
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