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简介> <变量与类型相关扩展
[edit] Last updated: Fri, 17 May 2013

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数组



简介> <变量与类型相关扩展
[edit] Last updated: Fri, 17 May 2013
 
add a note add a note User Contributed Notes 数组 - [18 notes]
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1
webmaster at infoproducts dot x10hosting dot com
4 years ago
New value can also be added to the array as shown below.
$theVariable["google"] = "http//google.com";
or
$theVariable["1"] = "http//google.com";
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4
Anonymous
4 years ago
@jorge at andrade dot cl
This variant is faster:
<?php
function array_avg($array,$precision=2){
    if(!is_array($array))
        return 'ERROR in function array_avg(): this is a not array';

    foreach($array as $value)
        if(!is_numeric($value))
            return 'ERROR in function array_avg(): the array contains one or more non-numeric values';
   
    $cuantos=count($array);
  return round(array_sum($array)/$cuantos,$precision);
}
?>
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4
applegrew at rediffmail dot com
4 years ago
For newbies like me.

Creating new arrays:-
//Creates a blank array.
$theVariable = array();

//Creates an array with elements.
$theVariable = array("A", "B", "C");

//Creating Associaive array.
$theVariable = array(1 => "http//google.com", 2=> "http://yahoo.com");

//Creating Associaive array with named keys
$theVariable = array("google" => "http//google.com", "yahoo"=> "http://yahoo.com");

Note:
New value can be added to the array as shown below.
$theVariable[] = "D";
$theVariable[] = "E";
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2
andyd273 at gmail dot com
4 years ago
A small correction to Endel Dreyer's PHP array to javascript array function. I just changed it to show keys correctly:

            function array2js($array,$show_keys)
            {
                $dimensoes = array();
                $valores = array();
              
                $total = count ($array)-1;
                $i=0;
                foreach($array as $key=>$value){
                    if (is_array($value)) {
                        $dimensoes[$i] = array2js($value,$show_keys);
                        if ($show_keys) $dimensoes[$i] = '"'.$key.'":'.$dimensoes[$i];
                    } else {
                        $dimensoes[$i] = '"'.addslashes($value).'"';
                        if ($show_keys) $dimensoes[$i] = '"'.$key.'":'.$dimensoes[$i];
                    }
                    if ($i==0) $dimensoes[$i] = '{'.$dimensoes[$i];
                    if ($i==$total) $dimensoes[$i].= '}';
                    $i++;
                }
                return implode(',',$dimensoes);
            }
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1
Jack A
4 years ago
Note that arrays are not allowed in class constants and trying to do so will throw a fatal error.
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2
spereversev at envionsoftware dot com
10 months ago
<?php
function array_mask(array $array, array $keys) {
    return array_intersect_key( $array, array_fill_keys( $keys, 0 ) );
}
?>

Might be helpful to take a part of associative array containing given keys, for example, from a $_REQUEST array

array_mask($_REQUEST, array('name', 'email'));
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2
Tyler Bannister
3 years ago
To delete an individual array element use the unset function

For example:

<?PHP
    $arr = array( "A", "B", "C" );
    unset( $arr[1] );
    // now $arr = array( "A", "C" );
?>

Unlink is for deleting files.
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0
info at curtinsNOSPAMcreations dot com
2 years ago
Another way to create a multidimensional array that looks a lot cleaner is to use json_decode.  (Note that this probably adds a touch of overhead, but it sure does look nicer.)  You can of course add as many levels and as much formatting as you'd like to the string you then decode.  Don't forget that json requires " around values, not '!!  (So, you can't enclose the json string with " and use ' inside the string.)

As an example:

<?php
    $myarray['blah'] = json_decode('[
        {"label":"foo","name":"baz"},
        {"label":"boop","name":"beep"}
    ]',true);

print_r($myarray)
?>
returns:

Array
(
    [blah] => Array
        (
            [0] => Array
                (
                    [label] => foo
                    [name] => baz
                )
 
            [1] => Array
                (
                    [label] => boop
                    [name] => beep
                )
        )
)
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0
John Marc
3 years ago
Be careful when adding elements to a numeric array.
I wanted to store some info about some items from a database and decided to use the record id as a key.

<?php
$key=3000000000;
$DATA[$key]=true;
?>

This will create an array of 30 million elements and chances are, you will use up all memory with these 2 lines

<?php
$key=3000000000;
$DATA["$key"]=true;
?>

This on the other hand will force the array to be an associative array and will only create the one element
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0
contact at greyphoenix dot biz
4 years ago
<?php
//Creating a multidimensional array

$theVariable = array("Search Engines" =>
array (
    0=> "http//google.com",
    1=> "http//yahoo.com",
    2=> "http//msn.com/"),

"Social Networking Sites" =>
array (
    0 => "http//www.facebook.com",
    1 => "http//www.myspace.com",
    2 => "http//vkontakte.ru",)
);

echo "The first array value is " . $theVariable['Search Engines'][0];
?>

-- Output--
The first array value is http://google.com
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-1
thomasdecaux at ebuildy dot com
4 years ago
To browse a simple array:

<?php

foreach ($myArray AS $myItem)
{

}

?>

To browse an associative array:

<?php

foreach ($myArray AS $key=>$value)
{

}

?>

http://www.ebuildy.com
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-1
macnimble at gmail dot com
4 years ago
Converting a linear array (like a mysql record set) into a tree, or multi-dimensional array can be a real bugbear. Capitalizing on references in PHP, we can 'stack' an array in one pass, using one loop, like this:

<?php
# array_stack()
# Original idea from:
# http://www.ideashower.com/our_solutions/
#   create-a-parent-child-array-structure-in-one-pass/
function array_stack (&$a, $p = '@parent', $c = '@children')
{
  $l = $t = array();
  foreach ($a AS $key => $val):
    if (!$val[$p]) $t[$key] =& $l[$key];
    else $l[$val[$p]][$c][$key] =& $l[$key];
    $l[$key] = (array)$l[$key] + $val;
  endforeach;
  return $a = array('tree' => $t, 'leaf' => $l);
}

# Example:
$node = array();
$node[1] = array('@parent' => 0, 'title' => 'I am node 1.');
#     ^-----------------------v Link @parent value to key.
$node[2] = array('@parent' => 1, 'title' => 'I am node 2.');
$node[3] = array('@parent' => 2, 'title' => 'I am node 3.');
$node[4] = array('@parent' => 1, 'title' => 'I am node 4.');
$node[5] = array('@parent' => 4, 'title' => 'I am node 5.');

array_stack($node);

$node['leaf'][1]['title'] = 'I am node one.';
$node['leaf'][2]['title'] = 'I am node two.';
$node['leaf'][3]['title'] = 'I am node three.';
$node['leaf'][4]['title'] = 'I am node four.';
$node['leaf'][5]['title'] = 'I am node five.';

echo '<pre>',print_r($node['tree'],TRUE),'</pre>';
?>

Note that there's no parameter checking on the array value, but this is only to keep the function size small. One could easily a quick check in there to make sure the $a parameter was in fact an array.

Hope you find it useful. Huge thanks to Nate Weiner of IdeaShower.com for providing the original function I built on.
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-1
alan dot lake at lakeinfoworks dot com
4 years ago
To delete an array key (and its value) from an array:

<?php
    function array_delete(&$ary,$key_to_be_deleted)
    {
        $new = array();
        if(is_string($key_to_be_deleted)) {
            if(!array_key_exists($key_to_be_deleted,$ary)) {
                return;
            }
            foreach($ary as $key => $value) {
                if($key != $key_to_be_deleted) {
                    $new[$key] = $value;
                }
            }
            $ary = $new;
        }
        if(is_array($key_to_be_deleted)) {
            foreach($key_to_be_deleted as $del) {
                array_delete(&$ary,$del);
            }
        }
    }
?>
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-1
sunear at gmail dot com
3 years ago
Made this function to delete elements in an array;

<?php

function array_del_elm($input_array, $del_indexes) {
    if (is_array($del_indexes)) {
        $indexes = $del_indexes;
    } elseif(is_string($del_indexes)) {
        $indexes = explode($del_indexes, " ");
    } elseif(is_numeric($del_indexes)) {
        $indexes[0] = (integer)$del_indexes;
    } else return;
    $del_indexes = null;
   
    $cur_index = 0;
    if (sort($indexes)) for($i=0; $i<count($input_array); $i++) {
        if ($i == $indexes[$cur_index]) {
            $cur_index++;
            if ($cur_index == count($indexes)) return $output_array;
            continue;
        }
        $output_array[] = $input_array[$i];
    }
    return $output_array;
}

?>

but then i saw the methods of doing the same by Tyler Bannister & Paul, could see that theirs were faster, but had floors regarding deleting multiple elements thus support of several ways of giving parameters. I combined the two methods to this to this:

<?php

function array_del_elm($target_array, $del_indexes) {
    if (is_array($del_indexes)) {
        $indexes = $del_indexes;
    } elseif(is_string($del_indexes)) {
        $indexes = explode($del_indexes, " ");
    } elseif(is_numeric($del_indexes)) {
        $indexes[0] = (integer)$del_indexes;
    } else return;
    unset($del_indexes);
   
    for($i=0; $i<count($indexes); $i++) {
        unset($target_array[$indexes[$i]]);
    }
    return $target_array;
}

?>

Fast, compliant and functional ;)
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-1
Endel Dreyer
4 years ago
Function to convert PHP arrays to JavaScript Array Object:
Useful in some cases.

<?php
function array2js($array,$show_keys=false)
{
    $dimensoes = array();
    $valores = array();
   
    $total = count ($array)-1;
    $i=0;
    foreach ($array as $key => $value) {
        if (is_array($value)) {
            $dimensoes[$i] = array2js($value,$show_keys);
        } else {
            $dimensoes[$i] = '"'.addslashes($value).'"';
            if ($show_keys) '"'.$key.'":'.$dimensoes[$i];
        }
        if ($i==0) $dimensoes[$i] = '['.$dimensoes[$i];
        if ($i==$total) $dimensoes[$i].= ']';
        $i++;
    }
    return implode(',',$dimensoes);
}
?>
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-3
dragos dot rusu at NOSPAM dot bytex dot ro
3 years ago
If an array item is declared with key as NULL, array key will automatically be converted to empty string '', as follows:

<?php
$a = array(
    NULL => 'zero',
    1    => 'one',
    2    => 'two');

// This will show empty string for key associated with "zero" value
var_dump(array_keys($a));

// Array elements are shown
reset($a);
while( key($a) !== NULL )
{
  echo key($a) . ": ".current($a) . "<br>";// PHP_EOL
  next($a);
}

// Array elements are not shown
reset($a);
while( key($a) != NULL ) // '' == null   => no iteration will be executed
{
  echo key($a) . ": ".current($a) . "<br>";// PHP_EOL
  next($a);
}
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-3
fo dot q dot who at gmail dot com
2 years ago
Just another way to pass a multidimensional php array to a js array, but i think a cool one so I decided to put this on here.

<?php

function array_print($item, $key, $array_name)
{
    if(is_array($item)){
        $array_name = $array_name."['".$key."']";
        echo $array_name ."= Array();". "";
        php_array_to_js_array($item, $array_name);
    }else{
        echo $array_name."['".$key."'] = \"".$item."\";";
    }
}

function php_array_to_js_array($array, $array_name){
    array_walk($array, 'array_print', $array_name);
}

?>
<script type="text/javascript" defer="defer">
<?php
        echo "js_array = Array();";
        php_array_to_js_array($array, "js_array");
       
?>
</script>

there is not much to say about that, its simple and understandable, i think... if not just email me. Have a nice day pplz !!

Patrick F.
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-4
jorge at andrade dot cl
4 years ago
To calculate the average of a array

<?php
function array_avg($array,$precision="2"){
    $a=0;
    if(is_array($array)){
        foreach($array as $value):
            if(!is_numeric($value)){
                $a++;
            }
        endforeach;
        if($a==0){
            $cuantos=count($array);
            return round(array_sum($array)/$cuantos,$precision);
        }else{
            return "ERROR in function array_avg(): the array contains one or more non-numeric values";
        }       
    }else{
        return "ERROR in function array_avg(): this is a not array";
    }
}
?>
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