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In php, you can use the count () or sizeof () functions to query the number of key value pairs in an array, both of which can get the number of key-value pairs (elements) in the array; the syntax "count ($array, 1)" or "sizeof ($array, 1)".

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

How does php query the number of key value pairs in an array

To query the number of key value pairs in an array is to query how many elements there are in the array, that is, the length of the array.

In PHP, two functions, count () and sizeof (), are provided to get the array length (one or more dimensions are fine, just set the second parameter to 1).

In fact, the sizeof () function is an alias for the count () function, so the usage of the two functions is the same.

Count ($array, $mode) sizeof ($array, $mode)

The parameters are described as follows:

$array: the array or object to be counted

$mode: optional parameter, which can be omitted.

If you omit the $mode parameter, or set it to COUNT_NORMAL or the 0account count () function will not detect multidimensional arrays

If $mode is set to COUNT_RECURSIVE or the 1 count () function will recursively count the number of elements in the array, it is especially useful for counting the number of elements in a multi-dimensional array.

Example:

One-dimensional array:

Two-dimensional array:

Three-dimensional array

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