php make array empty

1. The concept of arrays An array is a named range that is used to store a series of variable values. Each array element has an associated index (also a keyword) that can be used to access elements. PHP allows you to use numbers or strings evenly

PHP judgment Array is empty preferred method: Count ($arr), size ($arr); Copy the Code code as follows: $arr = Array ("");echo count ($arr);Echo size ($arr);Output 1 Copy the Code code as follows: $arr = Array ();echo count ($arr);Echo size ($arr);

The PHP decision array is the Null preferred method: Count ($arr), size ($arr); Copy Code code as follows: $arr = Array (""); echo count ($arr); Echo size ($arr); Output 1 Copy Code code as follows: $arr

PHP array operation summary php array usage tips. Array is an important method in PHP Data applications. PHP has a large number of array functions. The following is a summary of my learning. I will take this note to facilitate future authentication.

For Web programming, the most important thing is to access and read/write data. There may be many storage methods, such as strings, arrays, and files. Array is an important method in PHP Data applications. PHP has a large number of array functions.

For Web programming, the most important thing is to access and read/write data. There may be many storage methods, such as strings, arrays, and files. I learned arrays today, which is an important method in PHP Data applications. PHP has a large

Array is an important method in PHP Data Applications. PHP has a large number of array functions. The following is a summary of my learning. I will take this note to facilitate future authentication. 1. array Definition The array definition uses the

Php array usage details PHP array functions are numerous. The following is a summary of my learning, so that you can easily identify them later ...... I. array definition: array definition is defined using array (). you can define an empty array:.

PHP has a large number of array functions. The following is a summary of my learning, so that you can easily identify them later ...... I. array definition:The array definition uses the array () method to define an empty array: . Foreach traversal:

PHP's Isset () function is commonly used to detect whether a variable is setFormat: bool Isset (mixed var [, mixed Var [, ...])Function: Detect whether the variable is setreturn value:Returns FALSE if the variable does not existReturns FALSE if the