I have 2 data.
$dataA = 01,05,07;
$dataB = 01,07;
Now, I would like to explode the $dataA and combine back with only 2 string. like below:
$explode = explode(',',$dataA);
/*combine back get the max combination without duplicate string, example for the $dataA.
My suspect is: first array (01,05), second array(05,07), third array(07,01), I don't need (05,01) since first array have both value.
*/
After that, if the combination array value match with the $dataB (no matter which the value position is), then do something like:
$array[0] = '01,05';
$array[1] = '05,07';
$array[2] = '07,01';
//since $array[2] value = $dataB (no need to check specific position); so I would like to do as below
if(in_array(third array,$dataB)){ //use in_array or?
//do something
}
Is it any array function can done this?
Related
The following is the code
<?php
$id ="202883-202882-202884-0";
$str = implode('-',array_unique(explode('-', $id)));
echo $str;
?>
The result is
202883-202882-202884-0
for $id ="202883-202882-202882-0";, result is 202883-202882-0
I would like to replace the duplicate value with zero, so that the result should be like 202883-202882-0-0, not just remove it.
and for $id ="202883-0-0-0";, result should be 202883-0-0-0. zero should not be replaced, repeating zeros are allowed.
How can I archive that?
More info:
I want to replace every duplicate numbers. Because this is for a product comparison website. There will be only maximum 4 numbers. each will be either a 6 digit number or single digit zero. all zero means no product was selected. one 6 digit number and 3 zero means, one product selected and 3 blank.
Each 6 digit number will collect data from database, I dont want to allow users to enter same number multiple times (will happen only if the number is add with the URL manually.).
Update: I understand that my question was not clear, may be my English is poor.
Here is more explanation, this function is for a smartphone comparison website.
The URL format is sitename.com/compare.html?id=202883-202882-202889-202888.
All three numbers are different smartphones(their database product ID).
I dont want to let users to type in the same product ID like id=202883-202882-202882-202888. It will not display two 202882 results in the website, but it will cause some small issues. The URL will be same without change, but the internal PHP code should consider it as id=202883-202882-202888-0.
The duplicates should be replaced as zero and added to the end.
There will be only 4 numbers separated by "-".
The following examples might clear the cloud!
if pid=202883-202882-202889-202888 the result should be 202883-202882-202889-202888
if pid=202883-202883-202883-202888 the result should be 202888-0-0-0
if pid=202883-202882-202883-202888 the result should be 202883-202882-202888-0
if pid=202882-202882-202882-202882 the result should be 202882-0-0-0
I want to allow only either 6 digit numbers or single digit zero through the string.
if pid=rgfsdg-fgsdfr4354-202883-0 the result should be 202883-0-0-0
if pid=fasdfasd-asdfads-adsfds-dasfad the result should be 0-0-0-0
if pid=4354-45882-445202882-202882 the result should be 202882-0-0-0
It is too complicated for me create, I know there are bright minds out there who can do it much more efficiently than I can.
You can do a array_unique (preserves key), then fill the gaps with 0. Sort by key and you are done :)
+ on arrays will unify the arrays but prioritizes the one on the left.
Code
$input = "0-1-1-3-1-1-3-5-0";
$array = explode('-', $input);
$result = array_unique($array) + array_fill(0, count($array), 0);
ksort($result);
var_dump(implode('-',$result));
Code (v2 - suggested by mickmackusa) - shorter and easier to understand
Fill an array of the size of the input array. And replace by leftover values from array_unique. No ksort needed. 0s will be replaced at the preserved keys of array_unique.
$input = "0-1-1-3-1-1-3-5-0";
$array = explode('-', $input);
$result = array_replace(array_fill(0, count($array), 0), array_unique($array));
var_export($result);
Working example.
Output
string(17) "0-1-0-3-0-0-0-5-0"
Working example.
references
ksort - sort by key
array_fill - generate an array filled with 0 of a certain length
This is another way to do it.
$id = "202883-202882-202882-0-234567-2-2-45435";
From the String you explode the string into an array based on the delimiter which in this case is '-'/
$id_array = explode('-', $id);
Then we can loop through the array and for every unique entry we find, we can store it in another array. Thus we are building an array as we search through the array.
$id_array_temp = [];
// Loop through the array
foreach ($id_array as $value) {
if ( in_array($value, $id_array_temp)) {
// If the entry exists, replace it with a 0
$id_array_temp[] = 0;
} else {
// If the entry does not exist, save the value so we can inspect it on the next loop.
$id_array_temp[] = $value;
}
}
At the end of this operation we will have an array of unique values with any duplicates replaced with a 0.
To recreate the string, we can use implode...
$str = implode('-', $id_array_temp);
echo $str;
Refactoring this, using a ternary to replace the If,else...
$id_array = explode('-', $id);
$id_array_temp = [];
foreach ($id_array as $value) {
$id_array_temp[] = in_array($value, $id_array_temp) ? 0 : $value;
}
$str = implode('-', $id_array_temp);
echo $str;
Output is
202883-202882-0-0-234567-2-0-45435
This appears to be a classic XY Problem.
The essential actions only need to be:
Separate the substrings in the hyphen delimited string.
Validate that the characters in each substring are in the correct format AND are unique to the set.
Only take meaningful action on qualifying value.
You see, there is no benefit to replacing/sanitizing anything when you only really need to validate the input data. Adding zeros to your input just creates more work later.
In short, you should use a direct approach similar to this flow:
if (!empty($_GET['id'])) {
$ids = array_unique(explode('-', $_GET['id']));
foreach ($ids as $id) {
if (ctype_digit($id) && strlen($id) === 6) {
// or: if (preg_match('~^\d{6}$~', $id)) {
takeYourNecessaryAction($id);
}
}
}
I am a noob attempting to solve a program for a word search app I am doing. My goal is to take a string and compare how many times each letter of that string appears in another string. Then put that information into an array of key value pairs, where the key is each letter of the first string and the value is the number of times. Then order it with ar(sort) and finally echo out the value of the letter that appears the most (so the key with the highest value).
So it would be something like array('t' => 4, 'k' => '9', 'n' => 55), echo the value of 'n'. Thank you.
This is what I have so far that is incomplete.
<?php
$i = array();
$testString= "endlessstringofletters";
$testStringArray = str_split($testString);
$longerTestString= "alphabetalphabbebeetalp
habetalphabetbealphhabeabetalphabetalphabetalphbebe
abetalphabetalphabetbetabetalphabebetalphabetalphab
etalphtalptalphabetalphabetalbephabetalphabetbetetalphabet";
foreach ($testStringArray AS $test) {
$value = substr_count($longerTestString, $testStringArray );
/* Instead of the results of this echo, I want each $value to be matched with each member of the $testStringArray and stored in an array. */
echo $test. $value;
}
/* I tried something like this outside of the foreach and it didn't work as intended */
$i = array_combine($testStringArray , $value);
print_r($i);
If I understand correctly what you are after, then it's as simple as this:
<?php
$shorterString= "abc";
$longerString= "abccbaabaaacccb";
// Split the short sring into an array of its charachters
$stringCharachters = str_split($shorterString);
// Array to hold the results
$resultsArray = array();
// Loop through every charachter and get their number of occurences
foreach ($stringCharachters as $charachter) {
$resultsArray[$charachter] = substr_count($longerString,$charachter);
}
print_r($resultsArray);
I'm fairly new at php, but this seems to be me overlooking something completely basic?
I have some values in a database column, that are comma separated like so:
1,2,3
When I try to get the sum of the values, I expect the echo of array_sum to be 6, but I only get returned the first value ie. "1"
echo $amount; //Gives 1,2,3 etc.
$amount_array = array($amount);
echo array_sum($amount_array); //Only prints "1"
print_r($amount); // shows 1,2,3
print_r($amount_array); // shows Array ( [0] => 1,2,3 )
It's a string not an array, you have to split it using explode function:
$exploded = explode ( "," , $amount_array);
var_dump($exploded);
To use the array_sum the string needs to be converted to an array
You need to use the explode function:
$amount_array = explode(',', $amount);
So you total code should be like this:
$amount_array = explode(',', $amount);
echo array_sum($amount_array);
array_sum() works by adding up the values in an array. You only have one key=>value pair in your array: key 0 with a value of 1,2,3.
If you have a comma-separated list, and want that to be an array, I would use the explode() function to turn the list into the proper key=>value pairs that array_sum() would expect.
Try
$amount_array = explode(',',$amount);
You can not initialize an array the way you intend. You are passing in a comma-separated string, which is just a single argument. PHP doesn't automagically convert that string into separate arguments for you.
In order to convert a comma-separated string into an array of individual values you can break up the string with a function like explode(), which takes a delimiter and a string as its arguments, and returns an array of the delimiter-separated values.
$amount_array = explode( ',', $amount ); // now $amount_array is the array you intended
In my code I need to make a number of copies of a dummy array. The array is simple, for example $dummy = array('val'=> 0). I would like make N copies of this array and tack them on to the end of an existing array that has a similar structure. Obviously this could be done with a for loop but for readability, I'm wondering if there are any built in functions that would make this more verbose.
Here's the code I came up with using a for loop:
//example data, not real code
$existingArray = array([0] => array('val'=>2),[1] => array('val'=>3) );
$n = 2;
for($i=0;$i<$n;$i++) {
$dummy = array('val'=>0); //make a new array
$existingArray[] = $dummy; //add it to the end of $existingArray
}
To reiterate, I'd like to rewrite this with functions if such functions exist. Something along the lines of this (obviously these are not real functions):
//make $n copies of the array
$newvals = clone(array('val'=>0), $n);
//tack the new arrays on the end of the existing array
append($newvals, $existingArray)
I think you're looking for array_fill:
array array_fill ( int $start_index , int $num , mixed $value )
Fills an array with num entries of the value of the value parameter, keys starting at the start_index parameter.
So:
$newElements = array_fill(0, $n, Array('val' => 0));
You do still have to handle the appending of $newElements to $existingArray yourself, probably with array_merge:
array array_merge ( array $array1 [, array $... ] )
Merges the elements of one or more arrays together so that the values of one are appended to the end of the previous one. It returns the resulting array.
If the input arrays have the same string keys, then the later value for that key will overwrite the previous one. If, however, the arrays contain numeric keys, the later value will not overwrite the original value, but will be appended.
Values in the input array with numeric keys will be renumbered with incrementing keys starting from zero in the result array.
So:
$existingArray = array_merge($existingArray, $newElements);
This all works because your top-level arrays are numerically-indexed.
$count = count($itemArray);
// Create a new array slot to store the item #
$itemArray[$count] = $matches[1][$i];
$itemArray[$count][0] = 0;
This is part of a loop ($i is the index).
Everytime this part of the loop occurs, the number is successfully copies from $matches array to the $itemArray except the first digit of the entire number is replaced with a 0 every time. I'm sort of new to 2d arrays in php so I'm guessing the problems might lie within the 2d syntax.
Examples of what the values end up being (they should be the same)
$matches[1][$i] = 250924377376
$itemArray[$count] = 050924377376
You are not actually creating a 2-d array.
You have $itemArray which is an array.
When you do $itemArray[$count] = $matches[1][$i]; you are setting $itemArray[$count] to a string.
When you do $itemArray[$count][0] = 0; you are telling PHP to set the first character of $itemArray[$count] to 0 which is casts to a string.
In the old days of PHP, you could do this:
// create a string
$string = "Hello World!";
// reference the 2nd character in string
echo $string[1]; // "e"
PHP now discourages the array notation for strings in favor of curly braces like $string{1} instead, but the array notation still works.
I suspect the usage of curly braces was to disambiguate array access from string index access, but the old square brackets still work.
If you want a 2-d array, you should do this:
$itemArray[$count] = array(); // make $itemArray[$count] an array
$itemArray[$count][0] = 0; // set index 0 to (int)0
$itemArray[$count][1] = $matches[1][$i]; // set index 1 to the match