php is_function() to determine if a variable is a function

php is_function() to determine if a variable is a function

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Using `$this` in an anonymous function in PHP pre 5.4.0

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How to call a closure that is a class variable?

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Use keyword in functions - PHP [duplicate]

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Callback function using variables calculated outside of it

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Why use anonymous function? [duplicate]

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Why and how do you use anonymous functions in PHP?

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Anonymous functions in WordPress hooks

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How to use $this in closure in php

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What's the difference between closure parameters and the 'use' keyword?

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PHP use() function for scope?

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Is it possible to reference an anonymous function from within itself in PHP?

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Break array_walk from anonymous function

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PHP - self, static or $this in callback function

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How to code/reference to a PHP callable functions easy to manage for my IDE

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