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源代码
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>PHP array_key_exists() 实例 - 自学教程(runoops.com)</title> </head> <body> <?php $a = array("Volvo" => "XC90", "BMW" => "X5"); if (array_key_exists("Volvo", $a)) { echo "Key exists!"; } else { echo "Key does not exist!"; } ?> </body> </html>
运行结果: