How to check if a function exists in php

How to check whether a function exists in php: You can use the function_exists() function to judge. Returns true if the function exists, false otherwise. The specific usage method is: [function_exists('curl_init')].

The function_exists() function determines whether the given function has been defined. If function_name exists and is indeed a function, it returns TRUE , otherwise it returns FALSE .

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Syntax:

function_exists ( string $function_name ) : bool

Note: function_name must be a string.

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Code implementation:

if(function_exists('curl_init')){
    curl_init();
}else{    
    echo 'not function curl_init';
}

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