function_exists

Logo symfony/var-dumper symfony/var-dumper
Supported Versions: PHP 4, PHP 5, PHP 7, PHP 8
Return true if the given function has been defined
<?php function_exists(string $function): bool
<?php             return $s;

        }



        if (!\function_exists('iconv')) {

            throw new \RuntimeException('Unable to convert a non-UTF-8 string to UTF-8: required function iconv() does not exist. You should install ext-iconv or symfony/polyfill-iconv.');

        }
Dumper/AbstractDumper.php 
<?php         }



        if (\DIRECTORY_SEPARATOR === '\\') {

            return (\function_exists('sapi_windows_vt100_support')

                && @sapi_windows_vt100_support($stream))

                || false !== getenv('ANSICON')

                || 'ON' === getenv('ConEmuANSI')
Dumper/CliDumper.php 
<?php use Symfony\Component\VarDumper\VarDumper;



if (!function_exists('dump')) {
Resources/functions/dump.php 
<?php     }

}



if (!function_exists('dd')) {
Resources/functions/dump.php