$string = "php, photoshop, css";
I'm producing an array from the comma separated values above using the str_getcsv() function:
$array = str_getcsv($string);
Result:
Array ( [0] => php [1] => photoshop [2] => css )
How can I replace the key integers with a string tag for all elements like seen below?
Array ( [tag] => php [tag] => photoshop [tag] => css )
Edit: if not possible what alternative can I apply? I need the array keys to be identical for a dynamic query with multiple OR clauses
e.g.
SELECT * FROM ('posts') WHERE 'tag' LIKE '%php% OR 'tag' LIKE '%photoshop% OR 'tag' LIKE '%css%'
I'm producing the query via a function that uses the array key as a column name and value as criteria.
That is not possible. You can have only one item per key. But in your example, the string "tag" would be the key of every item.
The other way arround would work. So having an array like this:
array('php' => 'tag', 'photoshop' => 'tag', 'css' => 'tag');
This might help you, if you want to save the "type" of each entry in an array. But as all the entries of your array seems to be from the same type, just forget about the "tag" and only store the values in a numeric array.
Or you can use a multidimensional array within the numeric array to save the type:
array(
0 => array( 'type' => 'tag', 'value' => 'php' ),
1 => array( 'type' => 'tag', 'value' => 'photoshop' ),
2 => array( 'type' => 'tag', 'value' => 'css' )
);
But still using just an numeric array should be fine if all the entries have the same type. I can even think of a last one:
array(
'tag' => array('php', 'photoshop', 'css')
);
But even if I repeat myself: Just use an ordinary array and name it something like $tag!
BTW: explode(', ', %string) is the more common function to split a string.
To build SQL statement you might do something like this:
// ... inside you build function
if(is_array($value)){
$sql .= "'".$key."' LIKE '%."implode("%' OR '".$key."' LIKE '%", $value)."%'";
} else {
$sql .= "'".$key."' LIKE '%".$value."%'";
}
This might look confusing but it's much cleaner than runnig into two foreach-loops building the query.
That won't work. Your array keys have to be unique, or subsequent additions will simply overwrite the previous key.
As the others said, keys have to be unique. Otherwise, which element should be returned if you access $arr['tag']? If you now say "all of them", then create a nested array:
$array = array();
$array['tag'] = str_getcsv($string);
The value $array['tag'] will be another array (the one you already have) with numerical keys. This makes, because you have a list of tags and lists can be represented as arrays too.
Understanding arrays is very important if you want to work with PHP, so I suggest to read the array manual.
Assuming you know the size of your array beforehand
$tags = array("tag1","tag2","tag3");
$data = array("php","photoshop","css");
$myarray = array();
for ($i=0; $i<count($data); $i++) {
$myarray[$i] = array($data[$i], $tags[$i]);
}
Then
echo $myarray[0][0] . ", " . $myarray[0][1];
Outputs:
php, tag1
Related
I am setting this array manually:
$schools = array(
'Indiana University'=>array(
'initials'=>'IU',
'color'=>'red',
'directory'=>'indiana'
)
);
But it won't echo "IU" when I use:
echo $schools[0][0];
It does show correctly when I do:
print_r($schools);
I'm sure I'm messing up something dumb, but I have no idea what and I've been staring at it for hours. This array is actually part of a larger array with multiple universities, but when I trim it down to just this, it doesn't work.
PHP arrays support two types of keys - numerical and strings.
If you just push a value onto an array, it will use numerical keys by default. E.g.
$schools[] = 'Indiana University';
echo $schools[0]; // Indiana University
However, when you use string keys, you access the array values using the string key. E.g.
$schools = array(
'Indiana University' => array(
'initials' => 'IU',
'color' => 'red',
'directory' => 'indiana'
)
);
echo $schools['Indiana University']['initials']; // UI
I stuck with a problem: I have an array with IDs and want to assign theses IDs to a key of a associative array:
$newlinkcats = array( 'link_id' => $linkcatarray[0], $linkcatarray[1], $linkcatarray[2]);
this works fine, but I don't know how many entries in $linkcatarray. So I would like to loop or similar. But I don't know how.
no push, cause it is no array
no implode, cause it is no string
no =, cause it overrides the value before
Could anyone help?
Thanks
Jim
Why not just implode it ?
$newlinkcats = array(
'link_id' => implode(
',',
$linkcatarray
)
);
Or just do this:
// Suggested by Tularis
$newlinkcats = array(
'link_id' => $linkcatarray
);
If your $linkcatarray array is only comprised of the values you wish to assign to the link_id key, then you can simply point the key at that array:
$newlinkcats = array('link_id' => $linkcatarray);
If that array contains more values that you don't want included, then take a look at array_slice() to only grab the indexes you need:
// Grabs the first 3 values from $linkcatarray
$newlinkcats = array('link_id' => array_slice($linkcatarray, 0, 3));
If your desired indexes aren't contiguous, it may be easier to cherry-pick them and use a new array:
$newlinkcats = array('link_id' => array(
$linkcatarray[7],
$linkcatarray[13],
$linkcatarray[22],
// ...
));
I have a simple session array and I'm pushing page titles in it, as strings:
$_SESSION['sesArray'][] = $pageTitle;
and another predefined associative array with page titles and links:
$assoc=array(array('title' => 'page title', 'link' => 'page link'));
The session array gets flooded with titles so I'm taking out duplicates:
$array1 = array_unique($_SESSION['sesArray']);
My question is: how can I compare the $assoc array against $array1 to check for page titles that exist in both and eliminate them, ending up with another array that contains unique titles along with the link?
I have tried using:
$result= array_diff_key($assoc, $array1 );
But some duplicate titles are indeed removed and some are not.
Any ideas?
ETA data:
$array1= array('Museum', 'Club');
$assoc= array(array('title' => 'Museum', 'link' => 'museum.php' ),
array('title' => 'club', 'link' => 'club.php'));
You are not really doing a diff because an array of arrays is by definition going to have nothing in common with an array of scalars. What you need to do is filter $assoc based on the contents of $array1. Try this:
$array1= array('Museum','Club');
$assoc= array(array('title' => 'Museum', 'link' => 'museum.php' ),
array('title' => 'club', 'link' => 'club.php'));
$fn = function($arr) use ($array1) {
return !in_array($arr['title'], $array1);
};
$result =array_filter($assoc, $fn);
Ah, the infamous tech-interview problem ("compare 2 arrays and to find common entries").
try something along the lines of:
$ass = array_keys($assoc);
foreach($ass as $a)
{
while (isset($_SESSION['sesArray'][$a]))
{
unset($_SESSION['sesArray'][$a]);
}
}
The way PHP associates its tuple arrays allows you to avoid the ugly O(n^2) complexity of this issue.
I am new to using multidimensional arrays with php, I have tried to stay away from them because they confused me, but now the time has come that I put them to good use. I have been trying to understand how they work and I am just not getting it.
What I am trying to do is populate results based on a string compare function, once I find some match to an 'item name', I would like the first slot to contain the 'item name', then I would like to increment the priority slot by 1.
So when when I'm all done populating my array, it is going to have a variety of different company names, each with their respective priority...
I am having trouble understanding how to declare and manipulate the following array:
$matches = array(
'name'=>array('somename'),
'priority'=>array($priority_level++)
);
So, in what you have, your variable $matches will point to a keyed array, the 'name' element of that array will be an indexed array with 1 entry 'somename', there will be a 'priority' entry with a value which is an indexed array with one entry = $priority_level.
I think, instead what you probably want is something like:
$matches[] = array(name => 'somename', $priority => $priority_level++);
That way, $matches is an indexed array, where each index holds a keyed array, so you could address them as:
$matches[0]['name'] and $matches[0]['priority'], which is more logical for most people.
Multi-dimensional arrays are easy. All they are is an array, where the elements are other arrays.
So, you could have 2 separate arrays:
$name = array('somename');
$priority = array(1);
Or you can have an array that has these 2 arrays as elements:
$matches = array(
'name' => array('somename'),
'priority' => array(1)
);
So, using $matches['name'] would be the same as using $name, they are both arrays, just stored differently.
echo $name[0]; //'somename';
echo $matches['name'][0]; //'somename';
So, to add another name to the $matches array, you can do this:
$matches['name'][] = 'Another Name';
$matches['priority'][] = 2;
print_r($matches); would output:
Array
(
[name] => Array
(
[0] => somename
[1] => Another Name
)
[priority] => Array
(
[0] => 1
[1] => 2
)
)
In this case, could this be also a solution with a single dimensional array?
$matches = array(
'company_1' => 0,
'company_2' => 0,
);
if (isset($matches['company_1'])) {
++$matches['company_1'];
} else {
$matches['company_1'] = 1;
}
It looks up whether the name is already in the list. If not, it sets an array_key for this value. If it finds an already existing value, it just raises the "priority".
In my opinion, an easier structure to work with would be something more like this one:
$matches = array(
array( 'name' => 'somename', 'priority' => $priority_level_for_this_match ),
array( 'name' => 'someothername', 'priority' => $priority_level_for_that_match )
)
To fill this array, start by making an empty one:
$matches = array();
Then, find all of your matches.
$match = array( 'name' => 'somename', 'priority' => $some_priority );
To add that array to your matches, just slap it on the end:
$matches[] = $match;
Once it's filled, you can easily iterate over it:
foreach($matches as $k => $v) {
// The value in this case is also an array, and can be indexed as such
echo( $v['name'] . ': ' . $v['priority'] . '<br>' );
}
You can also sort the matched arrays according to the priority:
function cmp($a, $b) {
if($a['priority'] == $b['priority'])
return 0;
return ($a['priority'] < $b['priority']) ? -1 : 1;
}
usort($matches, 'cmp');
(Sourced from this answer)
$matches['name'][0] --> 'somename'
$matches['priority'][0] ---> the incremented $priority_level value
Like David said in the comments on the question, it sounds like you're not using the right tool for the job. Try:
$priorities = array();
foreach($companies as $company) {
if (!isset($priorities[$company])) { $priorities[$company] = 0; }
$priorities[$company]++;
}
Then you can access the priorities by checking $priorities['SomeCompanyName'];.
i'm trying to insert an implode generated string to an array that then later be used for json implementation
the implode generated string is look like this
'id' => $this->_SqlResult[0],'UserId' => $this->_SqlResult[1],'Msg' => $this->_SqlResult[2],'MsgStamp' => $this->_SqlResult[3]
i would like to used it in this code
$this->_JsonArr[]=array($Generated string);
to achieve something like this
$this->_JsonArr[]=array('id' => $this->_SqlResult[0],'UserId' => $this->_SqlResult[1],'Msg' => $this->_SqlResult[2],'MsgStamp' => $this->_SqlResult[3]);
instead i got something like this
$this->_JsonArr[]=array(" 'id' => $this->_SqlResult[0],'UserId' => $this->_SqlResult[1],'Msg' => $this->_SqlResult[2],'MsgStamp' => $this->_SqlResult[3]");
seem like generated string is treated as one element as key and value pair.
obviously i can get expected output from mysql because of this, can anybody help me with this
Why do you need to implode anything? Just pass the array:
$this->_JsonArr[] = your-non-imploded-array-here;
I think a full solution to what you want to do is something like this (i.e., the third code box in your question):
$row = array(
'id' => $this->_SqlResult[0],
'UserId' => $this->_SqlResult[1],
'Msg' => $this->_SqlResult[2],
'MsgStamp' => $this->_SqlResult[3]
);
$this->_JsonArr[] = $row;
$this->_JsonArr[]=array($Generated
string);
Looks like you want use arrays keys and values, but as I see you put into array plain string with expectation that array parse your plain string in format: keys => values.
You can try create array like below:
$this->_JsonArr[ $Generated_key ] = array( $Generated_value );
(Please correct me if I wrong understand your question).