I'm new to OOP in PHP, is that to seems correct ?
class whatever {
Function Maths() {
$this->sql->query($requete);
$i = 0;
while($val = mysql_fetch_array($this)) {
$tab[i][average] = $val['average'];
$tab[i][randomData] = $val['sum'];
$i=$i+1;
}
return $tab;
}
I want to access the data contained in the array
$foo = new whatever();
$foo->Maths();
for ($i, $i <= endOfTheArray; i++) {
echo Maths->tab[i][average];
echo Maths->tab[i][randomData];
}
Thank you ;)
EDIT: i want to output the result of the SQL query as an array, so i can access it from outside the class
In the interest of helping you out, here are some modifications. Please hear this, though: a lot of this might not make sense without a good background in PHP or OOP in general. You should look at #webbiedave's link.
class whatever {
static function maths() {
$tabs = array();
$results = $this->sql->query($requete);
while($val = mysql_fetch_array($this)) {
$tabs = $val;
}
return $tabs;
}
This fixes syntax errors and logic errors (for instance, the creation of the $results variable to hold the SQL query run).
I made the maths method static, since there's really no need to instantiate a whatever() object with this current example.
Here are some modifications to how this would be used:
$results = whatever::maths();
foreacho ($results as $result) {
echo $result['average'];
echo $result['randomData'];
}
Since maths() returns something, you need to store that in a variable; simply calling it, as you did previously, doesn't do anything.
That convoluted for loop can be replaced with a foreach loop.
Please check out PHP OOP basics:
http://www.php.net/manual/en/language.oop5.basic.php
Edit: Thanks for cleaning up the code. Try something along the lines of:
$tabs = array();
while($val = mysql_fetch_assoc($result)) {
$tabs[] = $val;
}
And:
$foo = new whatever();
$tabs = $foo->Maths();
for ($tabs as $tab) {
echo $tab['average'];
echo $tab['randomData'];
}
http://www.php.net/manual/en/language.oop5.basic.php
Related
I have an small piece of PHP code that needs to put every file in the current directory into an array.
I have done this by making reading the dir with glob() and when it meets another dir it will loop.
My code I have as of now:
<?php
$find = '*';
$result = array();
function find($find)
{
foreach (glob($find) as $entry)
{
$result[] = $entry;
echo $entry.'<br>';
if (is_dir($entry)){
$zoek = ''.$entry.'/*';
find($zoek);
}
}
return $result;
}
print_r(find($find));
?>
When I execute the code the echo print exactly what I want. But the printed array doesn't give me the values I want, it only gives the values in the first dir it will come by then it seems to stop adding the value in the array.
What am I doing wrong?
You need to actually preserve the results you produce in the recursive callings to your function:
<?php
function listNodesInFolder($find) {
$result = [];
foreach (glob($find) as $entry) {
$result[] = $entry;
if (is_dir($entry)) {
$result = array_merge($result, find($entry.'/*'));
}
}
return $result;
}
print_r(find('*'));
Once on it I also fixes a few other issues with your code:
$result should be declared as an array inside your function, that that even if it does not loop you still return an array and not something undefined.
indentation and location of brackets got adjusted to general coding standards, that makes reading your code much easier for others. Get used to those standards, it pays out, you will see.
no need for an extra variable for the search pattern inside the conditional.
a speaking name for the function that tells what it actually does.
you should not name variables and functions alike ("find").
You need to add the result of find() to the array
Edit added array_merge - Cid's idea
<?php
$find = '*';
function find($find)
{
$result = array();
foreach (glob($find) as $entry)
{
$result[] = $entry;
echo $entry.'<br>';
if (is_dir($entry)){
$zoek = ''.$entry.'/*';
$result = array_merge($result, find($zoek));
}
}
return $result;
}
print_r(find($find));
?>
I want to append new member to element which is in an array. Without array it's simple to write. for example:
$exp["app_form_id"] = $form_id;
But when I want add new member 'app_form_id' to all object of an array it not insert them and also there's not any error with them. I tried do it by 2 way, but none of them not worked:
1)
foreach ($exps as $exp) {
$exp["app_form_id"] = $form_id;
}
2)
for ($i = 0; $i < count($exps); $i++) {
$exps[i]["app_form_id"] = $form_id;
}
Your #1 method will work if you pass by reference (&):
foreach ($exps as &$exp) {
$exp["app_form_id"] = $form_id;
}
Try like this,
foreach ($exps as &$exp) {
$exp->app_form_id = $form_id;
}
I feel you are having manipulation with an object.
Give it a try, it should work.
Whatever you are changing inside block is limited to the block and not changing back, Try like this
$newExps = array();
foreach ($exps as $exp) {
$exp["app_form_id"] = $form_id;
$newExps[] = $exp;
}
print_r($newExps);
I'm running into an "Cannot redeclare" error and I can't figure out how to fix it. So I have a few functions in a php file located below. Now these functions iterate over an array of data.
I think I've surmised that the problem is that I'm looping the function over and over again in the foreach loop, and its the foreach loop thats been the problem. It seems like its already writing one the function to memory the first time and then for some reason it doesn't like being evoked again.
Your help appreciated.
P.S I've seen a number of similar posts on the issue such as Fatal error: Cannot redeclare but that doesn't seem to work.
<?php
// *****Code Omitted from Stack****
function postHelper($data, $field1, $field2)
{ //TODO Abstract and make sure post Helper and modify Post can be the same thing.
$result = array();
for ($j = 0; $j < count($data); ++$j) { //iterator over array
if ($field2 == "") {
$result[$j] = $data[$j][$field1];
} else {
return $result[$j] = $data[$j][$field1][$field2];
}
}
return $result;
}
//returns an array with only # and # values
function modifyPost($data)
{
//puts symbol # before read data
function addSymbol($data, $field1, $field2)
{
$info = postHelper($data, $field1, $field2);
foreach ($info as &$n) {
$n = '#' . $n;
}
print_r($info);
}
/*
Parse texts and returns an array with only # or # signs used
*/
function parseText($data)
{
$newarr = array();
$text = postHelper($data, "text", "");
foreach ($text as &$s) { //separates into words
$ex = explode(" ", $s);
foreach ($ex as &$n) { //if text doesnt' begin with '#' or '#' then throw it out.
if (substr($n, 0, 1) === '#' || strpos($n, '#') !== false) {
array_push($newarr, $n . ',');
}
}
}
return $newarr;
}
}
foreach ($posts as $entry) {
if (!function_exists('modifyPost')) {
$nval = "hello";
modifyPost($entry);
$entry['mod_post'] = $nval;
}
}
?>
EDIT: I've solved the error. Turns out that the original posts did actually work. I messed in naming. I will give points to anyone who can explain to me why this is necessary for a call. Moreover, I will update post if there is an additional questions that I have.
Php doesn't support nested functions. Although you technically can declare a function within a function:
function modifyPost($data)
{
function addSymbol($data, $field1, $field2)
the inner function becomes global, and the second attempt to declare it (by calling the outer function once again) will fail.
This behaviour seems counter-intuitive, but this is how it works at the moment. There's RFC about real nested functions, which also lists several workarounds for the problem.
The error says it all. You have duplicate modifyData() & parseText functions.
Remove the top half of the php file so only one of each occurs.
In php I am converting posted data from a form to objects like this:
<?php
...some code...
$post = new stdClass;
foreach ($_POST as $key => $val)
$post->$key = trim(strip_tags($_POST[$key]));
?>
Then in my page I just echo posted data like this :
<?php echo $post->Name; ?>
<?php echo $post->Address; ?>
etc...
This works fine but I have multiple checkboxes that are part of a group and I echo the results of that, like this:
<?php
$colors = $_POST['color_type'];
if(empty($colors))
{
echo("No color Type Selected.");
}
else
{
$N = count($colors);
for($i=0; $i < $N; $i++)
{
echo($colors[$i] . ", ");
}
}
?>
That works when I am just using array, but how do I write this as object syntax?
using your code
function array_to_object($arr) {
$post = new stdClass;
foreach ($arr as $key => $val) {
if(is_array($val)) {
$post->$key = post_object($val);
}else{
$post->$key = trim(strip_tags($arr[$key]));
}
}
return $post;
}
$post = array_to_object($_POST);
or more complex solution
function arrayToObject($array) {
if(!is_array($array)) {
return $array;
}
$object = new stdClass();
if (is_array($array) && count($array) > 0) {
foreach ($array as $name=>$value) {
$name = strtolower(trim($name));
if (!empty($name)) {
$object->$name = arrayToObject($value);
}
}
return $object;
}
else {
return FALSE;
}
}
from http://www.richardcastera.com/blog/php-convert-array-to-object-with-stdclass
why would you want that? What's wrong with an array?
Use Object Oriented Programming, which might be what you are looking for. Treat it as an object, by making a class called Color and doing $colors[$i] = new Color();
This way you can do whatever you want with it, and add functions to it.
Pretty simple -- when you attach the color_type key to your object, it'll become an array that's a property of your object. This is most likely what you want: you probably won't want to turn that array into its own stdClass-based object, because then you won't be able to iterate through all the values (as easily). Here's a snippet:
<?php
// putting in both of these checks prevents you from throwing an E_WARNING
// for a non-existent property. E_WARNINGs aren't dangerous, but it makes
// your error messages cleaner when you don't have to wade through a bunch
// of E_WARNINGS.
if (!isset($post->color_type) || empty($post->color_type)) {
echo 'No colour type selected.'; // apologies for the Canadian spelling!
} else {
// this loop does exactly the same thing as your loop, but it makes it a
// bit more succinct -- you don't have to store the count of array values
// in $N. Bit of syntax that speeds things up!
foreach ($post->color_type as $thisColor) {
echo $thisColor;
}
}
?>
Hope this helps! Of course, in a real-life setting, you'll want to do all sorts of data validation and cleaning -- for instance, you'll want to check that the browser actually passed an array of values for $_POST['color_type'], and you'll want to clean the output in case someone is trying to inject an exploit into your page (by going echo htmlspecialchars($thisColor); -- this turns all characters like < and > into HTML entities so they can't insert JavaScript code).
I have the following PHP code which works out the possible combinations from a set of arrays:
function showCombinations($string, $traits, $i){
if($i >= count($traits)){
echo trim($string) . '<br>';
}else{
foreach($traits[$i] as $trait){
showCombinations("$string$trait", $traits, $i + 1);
}
}
}
$traits = array(
array('1','2'),
array('1','2','3'),
array('1','2','3')
);
showCombinations('', $traits, 0);
However, my problem is that I need to store the results in an array for processing later rather than just print them out but I can't see how this can be done without using a global variable.
Does anyone know of an alternative way to achieve something similar or modify this to give me results I can use?
Return them. Make showCombinations() return a list of items. In the first case you only return one item, in the other recursive case you return a list with all the returned lists merged. For example:
function showCombinations(...) {
$result = array();
if (...) {
$result[] = $item;
}
else {
foreach (...) {
$result = array_merge($result, showCombinations(...));
}
}
return $result;
}
In addition to the other answers, you could pass the address of an array around inside your function, but honestly this isn't nearly the best way to do it.
Using the variable scope modifier static could work. Alternatively, you could employ references, but that's just one more variable to pass. This works with "return syntax".
function showCombinations($string, $traits, $i){
static $finalTraits;
if (!is_array($finalTraits)) {
$finalTraits = array();
}
if($i >= count($traits)){
//echo trim($string) . '<br>';
$finalTraits[] = $string;
} else {
foreach($traits[$i] as $trait){
showCombinations("$string$trait", $traits, $i + 1);
}
}
return $finalTraits;
}
$traits = array(
array('1','2'),
array('1','2','3'),
array('1','2','3')
);
echo join("<br>\n",showCombinations('', $traits, 0));
Of course, this will work as expected exactly once, before the static nature of the variable catches up with you. Therefore, this is probably a better solution:
function showCombinations($string, $traits, $i){
$finalTraits = array();
if($i >= count($traits)){
$finalTraits[] = $string;
} else {
foreach($traits[$i] as $trait){
$finalTraits = array_merge(
$finalTraits,
showCombinations("$string$trait", $traits, $i + 1)
);
}
}
return $finalTraits;
}
although the solution by Lukáš is the purest as it has no side effects, it may be ineffective on large inputs, because it forces the engine to constantly generate new arrays. There are two more ways that seem to be less memory-consuming
have a results array passed by reference and replace the echo call with $result[]=
(preferred) wrap the whole story into a class and use $this->result when appropriate
the class approach is especially nice when used together with php iterators
public function pageslug_genrator($slug,$cat){
$page_check=$this->ci->cms_model->show_page($slug);
if($page_check[0]->page_parents != 0 ){
$page_checks=$this->ci->page_model->page_list($page_check[0]->page_parents);
$cat[]=$page_checks['re_page'][0]->page_slug;
$this->pageslug_genrator($page_checks['re_page'][0]->page_slug,$cat);
}
else
{
return $cat;
}
}
this function doesnt return any value but when i m doing print_r $cat it re
store the results in a $_SESSION variable.