php is null when empty? [duplicate]

php is null when empty? [duplicate]

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Null vs. False vs. 0 in PHP

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PHP json_decode() returns NULL with valid JSON?

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Why I am getting Cannot pass parameter 2 by reference error when I am using bindParam with a constant value?

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Checking for an empty field with MySQL

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MySQL and PHP - insert NULL rather than empty string

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Check if value isset and null

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Difference between NULL and null in PHP

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How to specify null value as filter in a Doctrine query?

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How to select rows where column value IS NOT NULL using CodeIgniter's ActiveRecord?

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PHP considers null is equal to zero

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What is the PHP syntax to check "is not null" or an empty string? [duplicate]

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PHP is_null() and ==null [duplicate]

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Arrays with NULL keys

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PHP constructor to return a NULL

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