- Array_reverse
- min
- Count
- Max
Answer C
Instance
Returns an array in the reverse order of elements:
<?php$a=array ("A" = "Volvo", "B" and "BMW", "c" = "Toyota");p Rint_r ( array_reverse($a)
); >
Running an instance
Definition and usage
The Array_reverse () function returns an array in the reverse order of elements.
Description
The Array_reverse () function flips the order of elements in the original array, creates a new array, and returns.
If the second parameter is specified as true, the key name of the element remains unchanged or the key names are lost.
Grammar
Array_reverse (array,preserve)
Parameters |
Description |
Array |
Necessary. Specifies the array. |
Preserve |
Optional. Specifies whether the key name of the original array is preserved. This parameter is newly added in PHP 4.0.3. Possible values:
|
Technical details
return value: |
Returns the inverted array. |
PHP version: |
4 + |
Update log: |
Added the preserve parameter in PHP 4.0.3. |
More examples of examples 1
Returns the original array, reverses the array, and retains the inverted array of the original array key names:
<?php$a=array ("Volvo", "XC90", Array ("BMW", "Toyota")), $reverse =array_reverse ($a), $preserve = array_reverse($a,true)
;p rint_r ($a); Print_r ($reverse);p rint_r ($preserve);? >
Running an instance
Definition and usage
MIN () returns the minimum value.
Grammar
Min (x, y)
Parameters |
Description |
X |
Necessary. A number. |
Y |
Necessary. A number. |
Description
MIN () returns the smallest value in the parameter.
If there is only one parameter and an array, min () returns the smallest value in the array. If the first argument is an integer, a string, or a floating-point number, then at least two parameters are required and min () returns the smallest of these values. You can compare an unlimited number of values.
Hints and Notes
Note: PHP treats a non-numeric string as 0, but if this is the smallest value, it will still return a string. If more than one parameter evaluates to 0 and is the Minimum, min () returns the string with the lowest alphabetical order, or 0 if there are no strings.
Example
In this example, we will use min () to return the minimum value from two specified numbers:
<?phpecho (min (5,7)), Echo (min ( -3,5)), Echo (min ( -3,-5)), Echo (min (7.25,7.30)); >
The output is similar to:
5-3-57.25
Instance
Returns the number of elements in the array:
count($cars)
;? >
Running an instance
Definition and usage
The count () function returns the number of elements in the array.
Grammar
COUNT (array,mode);
Parameters |
Description |
Array |
Necessary. Specifies the array. |
Mode |
Optional. prescribed mode. Possible values:
- 0-Default. Do not count all elements in a multidimensional array
- 1-counts the number of elements in the array recursively (computes all elements in a multidimensional array)
|
Description
The count () function calculates the number of cells in an array or the number of properties in an object.
For an array, returns the number of its elements, and returns 1 for other values. Returns 0 if the argument is a variable and the variable is not defined.
If mode is set to Count_recursive (or 1), the number of elements in the array in the multidimensional array is recursively computed.
Technical details
return value: |
Returns the number of elements in the array. |
PHP version: |
4 + |
Update log: |
The mode parameter is added in PHP 4.2. |
More examples of examples 1
To count recursively on an array:
<?php$cars=array (" Volvo" =>array (" XC60", "XC90" ), "BMW" =>array ( " X3", "X5" ), "Toyota" =>array ( "Highlander" ) count($cars)."<br>"
count($cars,1)
; >
Definition and usage
Max () returns the maximum value.
Grammar
Max (x, y)
Parameters |
Description |
X |
Necessary. A number. |
Y |
Necessary. A number. |
Description
Max () returns the value with the largest number in the parameter.
If there is only one parameter and an array, Max () returns the largest value in the array. If the first argument is an integer, a string, or a floating-point number, then at least two parameters are required and Max () returns the largest of these values. You can compare an unlimited number of values.
Hints and Notes
Note: PHP treats non-numeric strings as 0, but if this is the maximum value, it will still return a string. If more than one parameter evaluates to 0 and is the maximum, max () returns 0 of the value, and if there is no value of 0 in the argument, the string that is the largest in alphabetical order is returned.
Example
In this example, we will use Max () to return the maximum value in two specified numbers:
<?phpecho (Max (5,7)), Echo (Max ( -3,5)), Echo (Max ( -3,-5)), Echo (Max (7.25,7.30)); >
The output is similar to:
75-37.3
[Single topic] which of the following functions is used to remove the number of elements of the PHP array