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New posts in isset

How do I check whether an environment variable is set in PHP?

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Check if variable is_undefined in PHP

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Isset expression error

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Will isset() return false if I assign NULL to a variable?

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Check if an array item is set in JS

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PHP - Checking if array index exist or is null

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What is the PHP shorthand for: print var if var exist

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isset PHP isset($_GET['something']) ? $_GET['something'] : ''

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PHP: Check if variable exist but also if has a value equal to something

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Calling a particular PHP function on form submit

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What's the difference between 'isset()' and '!empty()' in PHP?

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Test if an argument of a function is set or not in R

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is there something like isset of php in javascript/jQuery? [duplicate]

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Check if value isset and null

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PHP shorthand for isset()? [duplicate]

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If isset $_POST

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In where shall I use isset() and !empty()

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Best way to test for a variable's existence in PHP; isset() is clearly broken

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JavaScript isset() equivalent

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