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What will be the output of the following PHP code &lt...

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What will be the output of the following PHP code? 
<?php
$num = "123";
if (!filter_var($num, FILTER_VALIDATE_INT))
    echo("Integer is not valid");
else
    echo("Integer is valid");
?>

Answer & Solution
Correct Answer: Option C
filter_var() – Filters a single variable with a specified filter.
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What will be the output of the following PHP code? 
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$num = "123";
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    echo("Integer is not valid");
else
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?>
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