I'm new to PHP so I'm not sure how to optimize this code.
I execute a Python script from PHP and the $output variable returned is an array of arrays.
exec (" /Users/$USER/anaconda/bin/python /Applications/MAMP/cgi-bin/Evaluation1.py",$output)
Each array within the $output array contains one string value separated by commas. So $output is Array ( [0] => 1, 好, 0 [1] => 2, 妈妈, 3), etc.
In each array within the $output array, I use explode on the string value to create an array, and add it to my new $output array called $output2
$output2 = array();
foreach($output as $value){
$myArray = explode(',', $value);
$output2[] = $myArray;
}
Is there a way to just replace/overwrite the string value in the arrays within $output with the new array, instead of adding each item to a new $output2 array?
You could use array_walk to do the loop over output. You pass in a callback function that is called for each value by reference so any changes to the passed in value stick to the array.
Test data:
$output = array(
'1,A,2',
'2,B,3',
'3,C,4'
);
PHP >= 5.3.0
array_walk($output, function(&$val){ $val = explode(',', $val); } );
Older PHP
function mySplit(&$val){
$val = explode(',', $val);
}
array_walk($output, 'mySplit');
Both output:
Array
(
[0] => Array
(
[0] => 1
[1] => A
[2] => 2
)
[1] => Array
(
[0] => 2
[1] => B
[2] => 3
)
[2] => Array
(
[0] => 3
[1] => C
[2] => 4
)
)
Some great answers already. Just adding this for completeness.
$ar = array(
"1,2,3",
"4,5,6"
);
foreach($ar as $k => $v) {
$ar[$k] = explode(',', $v);
}
Wold be interesting to see a a performance difference of the different methods although i doubt it would be much.
Related
Hello I want to put values of single array into a multidimensional array with each value on a n+1
This is my array $structures
Array
(
[0] => S
[1] => S.1
[2] => S-VLA-S
[3] => SB
[4] => SB50
)
What I want for output is this
Array
(
[S] => Array(
[S.1] => Array (
[S-VLA-S] => Array (
[SB] => Array (
[SB50] => Array(
'more_attributes' => true
)
)
)
)
)
)
This is what I have tried so far
$structures = explode("\\", $row['structuurCode']);
foreach($structures as $index => $structure) {
$result[$structure][$structure[$index+1]] = $row['structuurCode'];
}
The values of the array is a tree structure that's why it would be handy to have them in an multidimensional array
Thanks in advance.
It becomes pretty trivial once you start turning it inside out and "wrap" the inner array into successive outer arrays:
$result = array_reduce(array_reverse($structures), function ($result, $key) {
return [$key => $result];
}, ['more_attributes' => true]);
Obviously a more complex solution would be needed if you needed to set multiple paths on the same result array, but this is the simplest solution for a single path.
Slightly different approach:
$var = array('a','an','asd','asdf');
$var2 = array_reverse($var);
$result = array('more_attributes' => true);
$temp = array();
foreach ($var2 as $val) {
$temp[$val] = $result;
$result = $temp;
$temp = array();
}
I have the array:
$total =array();
Array (
[0] => Array
(
[0] => 1
[1] => 3
)
[1] => Array
(
[0] => 6
[1] => 7
[2] => 8
)
[2] => Array
(
[0] => 9
[1] => 10
)
)
I need to dynamically change each array into an indexed array for a Cartesian function.
Here is how I need the code to look for the function to work correctly:
$count = cartesian(
Array(1,3),
Array(6,7,8),
Array(9,10)
);
Any help would be greatly appreciated! I have tried flattening, looping, using array_values, using just the array itself and I keep falling short.
Thanks
Nick
function cartesian() {
$_ = func_get_args();
if(count($_) == 0)
return array(array());
$a = array_shift($_);
$c = call_user_func_array(__FUNCTION__, $_);
$r = array();
foreach($a as $v)
foreach($c as $p)
$r[] = array_merge(array($v), $p);
return $r;
}
$count = call_user_func('cartesian', array($total));
print_r($count);
Your arrays already look exactly the way you want them to. array(1,3) is the same as array(0 => 1, 1 => 3) and both are an array with the value 1 at key 0 and 3 at key 1. Exactly what the debug output shows you.
It seems you just need to pass them as separate arguments to the function. E.g.:
cartesian($total[0], $total[1], $total[2])
For dynamic lengths of arrays, do:
call_user_func_array('cartesian', $total)
I believe that your $total array is multi-dimensional array with numeric indexed. So yo can try like this
$count = cartesian($total[0], $total[1], $total[2]);
I am stuck at a scenerio where i need to save user input like... (in 1 go i get these reuslt)
$string = "'a':'php,'b':'.Net' ...
'c' 'java'
'c' 'php'
'c' 'java'
'a' 'php'
'a' 'java' ";
Now i need to store all these values in a database (only unique pairs).
WHat i tried so far, exploded $string with "," and stored everything in an array like
$array["a"] = "php";...but this will overwrite a = java too... //problem
I don't need to check in database that if they exist already or not..this is handled already (all dumped data in one go get a unique identifier).
All i need to do is to get unique pairs and dump into database...means
a = php, a = java, b = .net, c = java, c=php
Only solution i could see was...after exploding ...check for the pair in db against new unique identified...mysql_num_rows...if does not exist then dump else dont...
Is there any easy way...??
The best way for your purpose is to create the multidimensional array
<?php
$string = "'a':'php','b':'.Net','c':'java','c':'php','c':'java','a':'php','a':'java'";
$array = array();
$temp_arr = explode(",", $string);
foreach($temp_arr as $key=>$value)
{
list($tempkey,$tempValue) = explode(':', $value);
$tempKey = trim($tempkey,"'");
$tempValue = trim($tempValue,"'");
$array[$tempKey][] = $tempValue;
}
$array = array_map('array_unique',$array);
echo "<pre>";
print_r($array);
?>
output will be
Array
(
[a] => Array
(
[0] => php
[2] => java
)
[b] => Array
(
[0] => .Net
)
[c] => Array
(
[0] => java
[1] => php
)
)
$string = "'a':'php,'b':'.Net','c':'java','c':'php','c':'java','a':'php','a':'java'";
$temp = array_map(function($item) {
list($key, $value) = explode(':', $item);
return array(str_replace("'", "", $key) => str_replace("'", "", $value));
}, explode(",", $string));
$results = array();
foreach($temp as $item) {
$key = key($item);
if(!isset($results[$key]) || !in_array($item[$key], $results[$key])) {
$results[$key][] = $item[$key];
}
}
print_r($results);
Output:
Array
(
[a] => Array
(
[0] => php
[1] => java
)
[b] => Array
(
[0] => .Net
)
[c] => Array
(
[0] => java
[1] => php
)
)
This question already has answers here:
Is there a function to extract a 'column' from an array in PHP?
(15 answers)
Closed 1 year ago.
Here's a section my multidimensional array:
Array (
[0] => Array ( [0] => Height [1] => 40 )
[1] => Array ( [0] => Weight [1] => 15 )
[2] => Array ( [0] => Ctr_Percent [1] => 15 )
)
What would the syntax be for just printing height, weight, and ctr_percent? I don't mean echoing it like:
echo $array[0][0];
echo $array[1][0];
Is there a way to iterate through the entire multidimensional array and echo out the first value of each child array?
Supposing you use php 5.3:
$first_elements = array_map(function($i) {
return $i[0];
}, $data);
Otherwise you need to implement a callback function or just use plain old foreach
Here is a one-liner:
array_map('array_shift', $array);
Will return:
Array
(
[0] => Height
[1] => Weight
[2] => Ctr_Percent
)
And here is another one:
array_combine(array_map('array_shift', $temp), array_map('array_pop', $temp))
Will return:
Array
(
[Height] => 40
[Weight] => 15
[Ctr_Percent] => 15
)
Use array_column:
$result = array_column($array, 0);
foreach ($main_array as $inner_array){
echo $inner_array[0] . "\n";
}
foreach($array as $x) {
echo $x[0]."\n";
}
I think the function your looking for is reset() e.g.
array_map('reset', $array);
or
foreach ($array as $subarray)
echo reset($subarray)."\n";
Note that this works even if 0 is not the first index of the array. E.g. $a = [1=>5,0=>3]; echo reset($a); would still echo 5;.
The easiest way to do it using array_walk
function getFirstElement(&$val){
$val = $val[0];
}
array_walk($data,'getFirstElement');
Now if you print $data like print_r($data); you will get result as below
Array
(
[0] => Height
[1] => Weight
[2] => Ctr_Percent
)
I'm trying to use a specific object type from a JSON feed, and am having a hard time specifying it. Using the code below I grab and print the specific array (max) I want,
$jsonurl = "LINK";
$json = file_get_contents($jsonurl,0,null,null);
$json_output = json_decode($json,true);
$max_output = $json_output["max"];
echo '<pre>';
print_r($max_output);
echo '</pre>';
And from the Array below, all I want to work with is the [1] objects in each array. How can I specify and get just those values?
Array
(
[0] => Array
(
[0] => 1309924800000
[1] => 28877
)
[1] => Array
(
[0] => 1310011200000
[1] => 29807
)
[2] => Array
(
[0] => 1310097600000
[1] => 33345
)
[3] => Array
(
[0] => 1310184000000
[1] => 33345
)
[4] => Array
(
[0] => 1310270400000
[1] => 33345
)
[5] => Array
(
[0] => 1310356800000
[1] => 40703
)
Well you could fetch those values with array_map:
$max_output = array_map(function($val) { return $val[1]; }, $json_output["max"]);
This requires PHP 5.3, if you use an earlier version, then you can use create_function to achieve similar results:
$max_output = array_map(create_function('$val', 'return $val[1];'), $json_output["max"]);
When you need to create new array which will contain only second values, you may use either foreach loop which will create it or use array_map() (just for fun with anonymous function available since php 5.3.0):
$newArray = array_map( function( $item){
return $item[1]
},$array);
Then you want to use last ("max" -> considering array with numeric keys) item, you can use end():
return end( $item);
And when you can process your data sequentially (eg. it's not part of some big getData() function) you can rather use foreach:
foreach( $items as $key => $val){
echo $val[1] . " is my number\n";
}
After you get $max_output...
for( $i = 0; $i < length( $max_output ); $i++ ) {
$max_output[$i] = $max_output[$i][1];
}
try this:
$ones = array();
foreach ($max_output as $r)
$ones[] = $r[1];