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function_exists

(PHP 3>= 3.0.7, PHP 4)

function_exists - TRUE , .

bool function_exists (string function_name)

̣ , () , function_name . TRUE , FALSE - .

if (function_exists('imap_open')) { echo "IMAP functions are available.<br>\n"; } else { echo "IMAP functions are not available.<br>\n"; }

, , - (image- ). , function_exists() FALSE , include_once() echo() .

. method_exists() get_defined_functions() .


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func_num_args get_defined_functions