在get_defined_vars中计算变量

I have unknown number of variables, for example:

$number_one = array(21,5,4,33,2,45);
$number_two = array(1,5,14,23,42,35);
$number_three = array(13,33,45,17,2,7);
$number_four = array(2,44,5,21,23,33);

I count all defined vars with $arr = get_defined_vars();

How can I count number of vars - in his case number of all arrays?

I used foreach, but maybe I don't do this properly.

$i = 0;
foreach ($arr as $value) {
    $i++;
    echo '<br>';
    foreach ($value as $val) {
        echo $val.',';
    }
}
echo $i;

I don't know why result is 8 :/

Try this:

<?php
    $number_one   = array(21,5,4,33,2,45);
    $number_two   = array(1,5,14,23,42,35);
    $number_three = array(13,33,45,17,2,7);
    $number_four  = array(2,44,5,21,23,33);
    $variable_s   = 'adsfadfdfa';
    $variable_n   = 22;

    $vararr = get_defined_vars();
    // We want to exclude all the superglobals
    $globalarrays = array(
        'GLOBALS', 
        '_SERVER', 
        '_POST', 
        '_GET', 
        '_REQUEST', 
        '_SESSION', 
        '_COOKIE', 
        '_ENV', 
        '_FILES'
    );

    $narrays = 0;
    foreach($vararr as $key => $variable) {
        if ( !in_array($key, $globalarrays) && is_array($variable) ) {
            echo $key . ' is an array<br />';
            $narrays++;
        }
    }

    echo '# arrays = ' . $narrays;

Notes:

• The code counts only arrays, no scalars (is_array()).
• It excludes the super global arrays like GLOBALS, _POST, etc.

Result:

number_one is an array
number_two is an array
number_three is an array
number_four is an array
# arrays = 4

The function get_defined_vars() gets all of the variables that are defined currently in the server including environment and server variables.

$number_one = array(21,5,4,33,2,45);
$number_two = array(1,5,14,23,42,35);
$number_three = array(13,33,45,17,2,7);
$number_four = array(2,44,5,21,23,33);
$arr = get_defined_vars();
print_r($arr);

Try this code and see the output in your browser. I'm sure you'll get to know how many variables are actually defined(including those defined by you)

For Reference: http://php.net/manual/en/function.get-defined-vars.php

it is all because, get_defined_vars() returns certain predefined indexes like GLOBALS, _POST, _GET, _COOKIE, _FILES and other indexes which are user defined, here in your case, those are number_one, number_two, number_three and number_four

for more details on get_defined_vars() you can refer the link

As the user defined indexes, are only after predefined indexes, you can use array_slice to slice your defined array.

$number_one = array(21,5,4,33,2,45);
$number_two = array(1,5,14,23,42,35);
$number_three = array(13,33,45,17,2,7);
$number_four = array(2,44,5,21,23,33);
$arr = get_defined_vars();
$arr    = array_slice($arr, 5, count($arr));
echo count($arr);

This prints the 4.