I am trying to search an array and see if a value is contained in it. If the value is in the array then the index of the value in the array will be passed onto be removed from the array.
The problem is array_search returns FALSE if the value is not found, but since false is a boolean it is also treated as 0. When this is passed to the unset to remove the value from the array the value at index 0 will be removed if array_search returned false.
I am fairly sure it will need to be put into an if statement but how will I handle the response if both an integer and a boolean can both be returned?
Current Code:
$pos = array_search($value, $array);
unset($array[$pos]);
PHP Doc says..
This function may return Boolean FALSE, but may also return a
non-Boolean value which evaluates to FALSE. Please read the section on
Booleans for more information. Use the === operator for testing the
return value of this function.
So you need to do like this
<?php
$arr = [1,2,3];
$pos = array_search(4, $arr);
if($pos!==false)
{
unset($arr[$pos]);
}
print_r($arr);
OUTPUT
Array
(
[0] => 1
[1] => 2
[2] => 3
)
As you can see the first index is retained.
try this
if($pos !== false)
{
// do your work to unset
}
note !== in above code
$x !== $y is True if $x is not equal to $y, or they are not of the same type
You can try this script, hope this will help you...
if(in_array($value, $array)){
$pos = array_search($value, $array);
unset($array[$pos]);
}
Related
I want to remove NULL, FALSE and '' values .
I used array_filter but it removes the 0' s also.
Is there any function to do what I want?
array(NULL,FALSE,'',0,1) -> array(0,1)
array_filter should work fine if you use the identical comparison operator.
here's an example
$values = [NULL, FALSE, '', 0, 1];
function myFilter($var){
return ($var !== NULL && $var !== FALSE && $var !== '');
}
$res = array_filter($values, 'myFilter');
Or if you don't want to define a filtering function, you can also use an anonymous function (closure):
$res = array_filter($values, function($value) {
return ($value !== null && $value !== false && $value !== '');
});
If you just need the numeric values you can use is_numeric as your callback: example
$res = array_filter($values, 'is_numeric');
From http://php.net/manual/en/function.array-filter.php#111091 :
If you want to remove NULL, FALSE and Empty Strings, but leave values of 0, you can use strlen as the callback function:
array_filter($array, 'strlen');
array_filter doesn't work because, by default, it removes anything that is equivalent to FALSE, and PHP considers 0 to be equivalent to false. The PHP manual has this to say on the subject:
When converting to boolean, the following values are considered FALSE:
the boolean FALSE itself
the integer 0 (zero)
the float 0.0 (zero)
the empty string, and the string "0"
an array with zero elements
an object with zero member variables (PHP 4 only)
the special type NULL (including unset variables)
SimpleXML objects created from empty tags
Every other value is considered TRUE (including any resource).
You can pass a second parameter to array_filter with a callback to a function you write yourself, which tells array_filter whether or not to remove the item.
Assuming you want to remove all FALSE-equivalent values except zeroes, this is an easy function to write:
function RemoveFalseButNotZero($value) {
return ($value || is_numeric($value));
}
Then you just overwrite the original array with the filtered array:
$array = array_filter($array, "RemoveFalseButNotZero");
Use a custom callback function with array_filter. See this example, lifted from PHP manual, on how to use call back functions. The callback function in the example is filtering based on odd/even; you can write a little function to filter based on your requirements.
<?php
function odd($var)
{
// returns whether the input integer is odd
return($var & 1);
}
function even($var)
{
// returns whether the input integer is even
return(!($var & 1));
}
$array1 = array("a"=>1, "b"=>2, "c"=>3, "d"=>4, "e"=>5);
$array2 = array(6, 7, 8, 9, 10, 11, 12);
echo "Odd :\n";
print_r(array_filter($array1, "odd"));
echo "Even:\n";
print_r(array_filter($array2, "even"));
?>
One-liners are always nice.
$clean_array = array_diff(array_map('trim', $my_array), array('', NULL, FALSE));
Explanation:
1st parameter of array_diff: The trimmed version of $my_array. Using array_map, surrounding whitespace is trimmed from every element via the trim function. It is good to use the trimmed version in case an element contains a string that is nothing but whitespace (i.e. tabs, spaces), which I assume would also want to be removed. You could just as easily use $my_array for the 1st parameter if you don't want to trim the elements.
2nd parameter of array_diff: An array of items that you would like to remove from $my_array.
Output: An array of elements that are contained in the 1st array that are not also contained in the 2nd array. In this case, because '', NULL, and FALSE are within the 2nd array, they can never be returned by array_diff.
EDIT:
It turns out you don't need to have NULL and FALSE in the 2nd array. Instead you can just have '', and it will work the same way:
$clean_array = array_diff(array_map('trim', $my_array), array(''));
function my_filter($var)
{
// returns values that are neither false nor null (but can be 0)
return ($var !== false && $var !== null && $var !== '');
}
$entry = array(
0 => 'foo',
1 => false,
2 => -1,
3 => null,
4 => '',
5 => 0
);
print_r(array_filter($entry, 'my_filter'));
Outputs:
Array
(
[0] => foo
[2] => -1
[5] => 0
)
check whether it is less than 1 and greater than -1 if then dont remove it...
$arrayValue = (NULL,FALSE,'',0,1);
$newArray = array();
foreach($arrayValue as $value) {
if(is_int($value) || ($value>-1 && $value <1)) {
$newArray[] = $value;
}
}
print_r($newArray);
Alternatively you can use array_filter with the 'strlen' parameter:
// removes all NULL, FALSE and Empty Strings but leaves 0 (zero) values
$result = array_filter($array, 'strlen');
https://www.php.net/manual/en/function.array-filter.php#111091
function ExtArray($linksArray){
foreach ($linksArray as $key => $link)
{
if ($linksArray[$key] == '' || $linksArray[$key] == NULL || $linksArray[$key] == FALSE || $linksArray[$key] == '')
{
unset($linksArray[$key]);
}else {
return $linksArray[$key];
}
}
}
This function may help you
EDIT2: This goes to the top for a reason. This question is asked wrong, but I won´t change the title, since maybe other people are caught in this misstake. I am NOT looking for an "average" - I merely want to exit with the first "false" in an array.
My though to this questions were quite twisted - therefore I asked the wrong question.
Anyway: As stated, I won´t change the question itself.
What I want to do is basically calculate something like a boolean average of an array. I know about booleans and that they are not meant to be something with an average, but please read on to see what I am doing.
My array looks like this:
$array = array(
true,
false,
true,
true
);
I now want to get an AND-operation done on this array to see, if everything in there is true or if a subfunction returned false. This is basically a list of results from different subfunctions.
This specific example then should return false, because $array[1] is false.
EDIT:
What I am looking for is a builtin PHP-function which seems not to exists. A custom implementation has the advantage to exit the iteration over this array in comparison to in_array() which might not do this.
Can you help me out, stackoverflow?
Try in_array:
$array = array(
true,
false,
true,
true
);
echo in_array(false, $array);
If one of the elements is false, it will return false otherwise it returns true.
Update: in_array, returns out of the loop as soon as the searched value is matched. The worst case I suppose is when you have a single false at the end of the searched array. The linked source are for PHP 5.3.
As far as strict checking is concerned, you can do so passing in the third parameter to in_array:
echo in_array(false, $array, true);
Come on, it would appear you didn't even try:
function checkArray(array $in)
{
foreach ($in as $bool)
{
if (!$bool)//replace with type&value checking if that's what you're after
return false;
}
return true;
}
var_dump(checkArray(array(true, false, true, true)));//false
var_dump(checkArray(array(true, true)));//true
There are, of course, a bunch of alternative ways to do what you want/need, depending on what the actual data will look like. If it's all booleans:
if (array_sum($array) != count($array))
{//true == 1, array_sum(array(true, true)) == count(array(true, true)) == 2
echo 'array contains false, or non-boolean values, like 123';
}
//for a real average:
$avg = round(array_sum($array)/count($array));
The latter will yield 1 if 50%>= of the values in the array are true, and 0 otherwise. It's then a simple matter of casting that value to a boolean to get the "average bool value":
$avg = (bool) round(
array_sum($array)/count($array)
);
or, for example:
$valsAsKey = array_flip(
array_map(
'intval',//make ints
$array
)
);
if (isset($valsAsKey[0]))
{//(int) false === 0
echo 'False in array';
}
Though these approaches don't use iteration explicitly, they do iterate the array data implicitly. A quick test did show that the simple foreach outperformed the other approaches here.
I have tried around a lot, until i came to this final result.
This is my code:
<?php
$array = array();
$array[] = true;
$array[] = false;
$array[] = false;
$array[] = true;
$array[] = false;
var_dump($array);
if((count($array)/2) <= array_sum($array)){
echo "true";
// return true
} else {
echo "false";
// return false
}
?>
it counts the elements of the array, and compares it with the COUNTED trues (array_sum($array)). Then it returns true or false, dependent on result.
You could iterate through the array and set a result to false if any vals are false;
$result = true;
foreach ($array as $v) {
if ($v===false) $result = false;
}
You can use array_filter without callback. In this case all entries of array equal to false will be removed.
if (count(array_filter($array)) == count($array)) echo 'TRUE';
I tried to find the key of an array value in an array. So i tried array_search() to do this. Which should return key if it found the value and false if there is no equal value present. In here am getting false even the string(testing#example.com) is exist.
<?php
$one = array('testing#example.com','example#example.com');
$two = array('testing#example.com');
var_dump(array_search($one,$two)); // getting false even the string exist,
//am i missing any thing
?>
I get false, is this because of # symbol in the string? i don't know. Can anyone give a idea on this?
To use array_search in your case you have to give as a first parameter just string - not an array:
$one = array('testing#example.com','example#example.com');
$two = array('testing#example.com');
var_dump(array_search('testing#example.com',$two));
Then it will work.
If you want to find all values from array $one in array $two, use array_intersect:
$intersection = array_intersect('testing#example.com',$two);
then check if found with simple count:
var_dump( count($intersection) > 0 );
0 means false in php and array_search return array keys, you should use === operator to check
if(array_search($one,$two) !== false )
// exists
Warning This function may return Boolean FALSE, but may also return a
non-Boolean value which evaluates to FALSE. Please read the section on
Booleans for more information. Use the === operator for testing the
return value of this function.
REFERENCE
It should be:
$one = array('testing#example.com','example#example.com');
$two = array('testing#example.com');
var_dump(array_search($two,$one));
see: function array_search
you can just reverse
$one
and
$two
var_dump(array_search($two,$one));
Try this:
<?php
$one = array('testing#example.com','example#example.com');
$two = array('testing#example.com');
var_dump(in_array($two, $one)); // true
// also, isset more fast in case when $two is string:
$two = 'testing#example.com';
var_dump(isset($one[$two])); // true
In array_search it checks that first parameter is in the second parameter.
array_search($one,$two)
You are checking the larger array in smaller array.
what you should do is check smaller array is in larger array like this
array_search($two,$one)
I have an associative array in which I need to count the number of boolean true values within.
The end result is to create an if statement in which would return true when only one true value exists within the array. It would need to return false if there are more then one true values within the array, or if there are no true values within the array.
I know the best route would be to use count and in_array in some form. I'm not sure this would work, just off the top of my head but even if it does, is this the best way?
$array(a->true,b->false,c->true)
if (count(in_array(true,$array,true)) == 1)
{
return true
}
else
{
return false
}
I would use array_filter.
$array = array(true, true, false, false);
echo count(array_filter($array));
//outputs: 2
Array_filter will remove values that are false-y (value == false). Then just get a count. If you need to filter based on some special value, like if you are looking for a specific value, array_filter accepts an optional second parameter that is a function you can define to return whether a value is true (not filtered) or false (filtered out).
Since TRUE is casted to 1 and FALSE is casted to 0. You can also use array_sum
$array = array('a'=>true,'b'=>false,'c'=>true);
if(array_sum($array) == 1) {
//one and only one true in the array
}
From the doc : "FALSE will yield 0 (zero), and TRUE will yield 1 (one)."
Try this approach :
<?php
$array = array(1, "hello", 1, "world", "hello");
print_r(array_count_values($array));
?>
Result :
Array
(
[1] => 2
[hello] => 2
[world] => 1
)
Documentation
like this?
$trues = 0;
foreach((array)$array as $arr) {
$trues += ($arr ? 1 : 0);
}
return ($trues==1);
Have you tried using array_count_values to get an array with everything counted? Then check how many true's there are?
I need to have an array_search search my array strictly making sure that the item is identical (meaning the whole thing is the same thing as the input value). I know about the third variable in a array_search() function in PHP - the Strict one, but I don't want it to check if its the same instance, as it is not. How would I do this?
Here is the code I'm currently using:
array_search(some, array(someItem,anothervariable, yetanothervariable, some));
//output - 0 (the first item) which contains some but isn't exactly some.
Requested output:
Instead of outputting the first item that contains some, someItem, it would output the key for the last item, 3, that is the exact search value.
Array search with strict is equivalent to the === operator.
Array search without strict is equivalent to the == operator.
If you need some sort of special comparison that isn't covered by either of them (comparing elements of objects for example) then you need to write a loop.
Are you open to using a foreach loop instead of array_search?
If so try this:
$haystack = array('something', 'someone', 'somewhere', 'some');
$needle = 'some';
foreach($haystack as $key=>$straw){
if($straw === $needle){
$straws[$key] = $straw;
}
}
print_r($straws);
it will print
Array ( [3] => some )
Or you could use array_keys() with the search value specified.
Then, using the same $haystack and $needle above:
$result = array_keys($haystack,$needle,TRUE);
print_r($result);
This returns:
Array ( [0] => 3 )
The first argument is the array to return keys from, The second arg is the search value, if you include this arg, then only keys from array elements that match the search value are returned. Including the third boolean arg tells the function to use match type as well (===).
Not really sure what you are asking but in PHP strict comparison is achieved with the
triple equal sign (===). This means that both the value and the type must be the same.
So if you compare a string "1" and an integer 1 with === it will fail.
If strict is false then comparing string "1" with integer 1 would succeed.
This is the meaning of strict in the array_search case.
I implemented array_search below so you can see what it is doing.
function my_array_search($input, $search_array, $strict=false) {
if(is_array($search_array)) {
foreach($search_array as $key => $val) {
if($strict === true) {
if($val === $input) {
return $key;
}
} else {
if($val == $input) {
return $key;
}
}
}
}
}