What is the name of the function in php that determines whether an array exists?

The function in php to determine whether an array exists is called "is_array()". The function of this function is to determine whether a specified variable is an array. The syntax is "is_array($array variable name)"; if it returns true, If false is returned, the specified array does not exist.

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

How to determine whether the array exists in php The function is called "is_array()".

The is_array() function is used to determine whether a specified variable is an array; in other words, it can also determine whether the specified array exists.

is_array($数组变量名)

• If true is returned, the specified array exists, if false is returned, the specified array does not exist.

Example:

"; }else{ echo "数组不存在
"; } } $a = array(1,2,3,4,5); $b = 123; f($a); f($b); ?>

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