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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
)
)
)
if you need to pass information using querystring like this
..yourProgram.php?value1=value&value2=value&value3=value, you can create a variable for each value keys and make it equal to the value.. here's the code
<?php
$qs = explode('&',$_SERVER['QUERY_STRING']);
foreach($qs as $key=>$value)
{
$temp = explode('=',$value);
${current($temp)} = end($temp);
}
?>
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);
}
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
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 ;)
To delete an individual array element use the unset function
For example:
<?PHP
$arr = array( "A", "B", "C" );
unset( $arr[1] );
// now $arr = array( "A", "C" );
?>
Unlink is for deleting files.
To browse a simple array:
<?php
foreach ($myArray AS $myItem)
{
}
?>
To browse an associative array:
<?php
foreach ($myArray AS $key=>$value)
{
}
?>
http://www.ebuildy.com
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 $a parameter was in fact an array.
Hope you find it useful. Huge thanks to Nate Weiner of IdeaShower.com for providing the original function I built on.
A small correction to Endel Dreyer's PHP array to javascript array function. I just changed it to show keys correctly:
function array2js($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);
}
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);
}
?>
@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,$precision);
}
?>
To calculate the average of a array
<?php
function array_avg($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,$precision);
}else{
return "ERROR in function array_avg(): the array contains one or more non-numeric values";
}
}else{
return "ERROR in function array_avg(): this is a not array";
}
}
?>
To delete an array key (and its value) from an array:
<?php
function array_delete(&$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);
}
}
}
?>
New value can also be added to the array as shown below.
$theVariable["google"] = "http//google.com";
or
$theVariable["1"] = "http//google.com";
Note that arrays are not allowed in class constants and trying to do so will throw a fatal error.
<?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
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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