Display comma after displaying last value:
$len = count($boltpatterns);
foreach ($boltpatterns as $key => $boltpattern) {
$st1=$boltpattern['BP'];
$st2='-';
$pos=strpos($st1,$st2);
if($pos === false){
} else {
echo $st1;
if($key != $len - 1) {
echo ',';
}
}
}
You could have simply used array_column() and implode() function.
array_column() lists all your 'BP' keys into one single dimensional array.
implode() converts this single dimensional array $arr into string, separating each entry with a comma.
$arr = array_column($boltpatterns, 'BP');
echo implode(',', $arr);
Just add a new variable that will keep track of how many items you have looped through.
$len = count($boltpatterns);
$count = 1;
foreach ($boltpatterns as $key => $boltpattern) {
$st1=$boltpattern['BP'];
$st2='-';
$pos=strpos($st1,$st2);
if($pos === false){
} else {
echo $st1;
if($count != $len) {
echo ',';
}
}
++$count;
}
You can do this like this,
$valid_data = array();
foreach ($boltpatterns as $key => $boltpattern) {
if ( false !== strpos($boltpattern['BP'],'-') ){
$valid_data[] = $boltpattern['BP'];
}
}
echo implode(", ", $valid_data);
Explanation: Here we collect all the valid date we need to display to a new array. And we use PHP inbuilt function to display them.
Hope this will help you.
$arr = array_column($boltpatterns, 'BP');
echo rtrim(implode(', ', $arr), ', ');
This is an improved version of #object-manipulator's code, with rtrim removing the trailing comma.
i have converted a word as per requirement to an array, done some functions and now again i want to convert it back to a word. when i add a break on the echo, i see it still acts as an array.
$word='someword';
$arr= str_split($word);
foreach ($arr as $value)
echo $words =chr(ord($value)+2).'<br>';
The result of above is
u q o g y q t f
i did a function to check whether my requirement is met.
failed
Please help, i have tried implode, merge, join
if($words!='uqogyqtf'){
echo 'failed';
}else{
echo 'Okay';
}
Your code should be:
$word='someword';
$arr= str_split($word);
$words = [];
foreach ($arr as $value) {
$words[] =chr(ord($value)+2);
}
echo implode('', $words);
In your code at some point $words contained only on character at a time, not keeping the previous values.
Take out the line-break in your code and concatenate the variable and it should work fine.
$word='someword';
$arr= str_split($word);
$words = '';
foreach ($arr as $value)
$words .=chr(ord($value)+2);
echo $words;
if($words!='uqogyqtf'){
echo 'failed';
}else{
echo 'Okay';
}
Ouput(take out echo $words; to only have "Okay"):
uqogyqtfOkay
function convertword($word)
{ $myarray = str_split($word);
foreach ($myarray as $key => $value)
{ $mynewarray[$key] = chr(ord($myarray[$key])+2);
}
$newword = implode("", $mynewarray);
return $newword;
}
This works for me :)
I need to convert my array:
$tdata = array(11,3,8,12,5,1,9,13,5,7);
Into a string like this:
11-3-8-12-5-1-9-13-5-7
I was able to get it work with:
$i = 0;
$predata = $tdata[0];
foreach ($tdata as $value)
{
$i++;
if ($i == 10) {break;}
$predata.='-'.$tdata[$i];
}
But was wondering if there is an easier way?
I tried something like:
$predata = $tdata[0];
foreach ($tdata as $value)
{
if($value !== 0) {
$predata.= '-'.$tdata[$value];
}
}
but it result in bunch of Undefined Offset errors and incorrect $predata at the end.
So I want to learn once and for all:
How to loop through the entire array starting from index 1 (while excluding index 0)?
Is there a better approach to convert array into string in the fashion described above?
Yes there is a better approach to this task. Use implode():
$tdata = array(11,3,8,12,5,1,9,13,5,7);
echo implode('-', $tdata); // this glues all the elements with that particular string.
To answer question #1, You could use a loop and do this:
$tdata = array(11,3,8,12,5,1,9,13,5,7);
$out = '';
foreach ($tdata as $index => $value) { // $value is a copy of each element inside `$tdata`
// $index is that "key" paired to the value on that element
if($index != 0) { // if index is zero, skip it
$out .= $value . '-';
}
}
// This will result into an extra hypen, you could right trim it
echo rtrim($out, '-');
i have the following code:
while (list($key, $value) = each($arr)) {
$implode_keys_values = #"$key=$value,";
echo"$implode_keys_values";
}
which ends up echoing out xxxx=xxxx,xxxx=xxxx,xxxx=xxxx,xxxx=xxxx,
depending on how many keys/values there are.
how do I take this dynamically changing string and remove the very last comma on it?
keep in mind:
$implode_keys_values = substr($implode_keys_values,0,-1);
will not work, it will take out all the commas.
rtrim($implode_keys_values, ",") would cut trailing commas.
You can learn more about rtrim here at the PHP docs
$implode_keys_values = "";
while (list($key, $value) = each($arr)) {
$implode_keys_values .= #"$key=$value,";
}
echo rtrim($implode_keys_values, ",");
PHP has a function built in for that if the data in the array is not too complex (works for the xxxxxx values you have, can break with others):
echo http_build_query($arr, '', ',');
See http_build_query().
Another alternative is using iterators and checking if the current iteration is the last one. The CachingIterator::hasNext() method is helpful for that:
$it = new CachingIterator(new ArrayIterator($arr));
foreach($it as $key => $value) {
echo $key, '=', $value, $it->hasNext() ? ',' : '';
}
This variant does work with any data.
In your case, this would be a better way to implement implode():
$data = array();
while (list($key, $value) = each($arr)) {
$data[] = "$key=$value";
}
echo implode(",",$data);
I am writing a SQL query creator using some parameters. In Java, it's very easy to detect the last element of an array from inside the for loop by just checking the current array position with the array length.
for(int i=0; i< arr.length;i++){
boolean isLastElem = i== (arr.length -1) ? true : false;
}
In PHP they have non-integer indexes to access arrays. So you must iterate over an array using a foreach loop. This becomes problematic when you need to take some decision (in my case to append or/and parameter while building query).
I am sure there must be some standard way of doing this.
How do you solve this in PHP?
It sounds like you want something like this:
$numItems = count($arr);
$i = 0;
foreach($arr as $key=>$value) {
if(++$i === $numItems) {
echo "last index!";
}
}
That being said, you don't -have- to iterate over an "array" using foreach in php.
You could get the value of the last key of the array using end(array_keys($array)) and compare it to the current key:
$last_key = end(array_keys($array));
foreach ($array as $key => $value) {
if ($key == $last_key) {
// last element
} else {
// not last element
}
}
Note: This doesn't work because calling next() advances the array pointer, so you're skipping every other element in the loop
why so complicated?
foreach($input as $key => $value) {
$ret .= "$value";
if (next($input)==true) $ret .= ",";
}
This will add a , behind every value except the last one!
When toEnd reaches 0 it means it is at the last iteration of the loop.
$toEnd = count($arr);
foreach($arr as $key=>$value) {
if (0 === --$toEnd) {
echo "last index! $value";
}
}
The last value is still available after the loop, so if you just want to use it for more stuff after the loop this is better:
foreach($arr as $key=>$value) {
//something
}
echo "last index! $key => $value";
If you do not want to treat the last value as special inside loops. This should be faster if you have large arrays. (If you reuse the array after the loop inside the same scope you have to "copy" the array first).
//If you use this in a large global code without namespaces or functions then you can copy the array like this:
//$array = $originalArrayName; //uncomment to copy an array you may use after this loop
//end($array); $lastKey = key($array); //uncomment if you use the keys
$lastValue = array_pop($array);
//do something special with the last value here before you process all the others?
echo "Last is $lastValue", "\n";
foreach ($array as $key => $value) {
//do something with all values before the last value
echo "All except last value: $value", "\n";
}
//do something special with the last value here after you process all the others?
echo "Last is $lastValue", "\n";
And to answer your original question "in my case to append or/and parameter while building query"; this will loop over all the values, then join them together to a string with " and " between them but not before the first value or after the last value:
$params = [];
foreach ($array as $value) {
$params[] = doSomething($value);
}
$parameters = implode(" and ", $params);
There are already many answers, but it's worth to look into iterators as well, especially as it has been asked for a standard way:
$arr = range(1, 3);
$it = new CachingIterator(new ArrayIterator($arr));
foreach($it as $key => $value)
{
if (!$it->hasNext()) echo 'Last:';
echo $value, "\n";
}
You might find something that does work more flexible for other cases, too.
One way could be to detect if the iterator has next. If there is no next attached to the iterator it means you are in the last loop.
foreach ($some_array as $element) {
if(!next($some_array)) {
// This is the last $element
}
}
SINCE PHP 7.3 :
You could get the value of the last key of the array using array_key_last($array) and compare it to the current key:
$last_key = array_key_last($array);
foreach ($array as $key => $value) {
if ($key == $last_key) {
// last element
} else {
// not last element
}
}
to get first and last element from foreach array
foreach($array as $value) {
if ($value === reset($array)) {
echo 'FIRST ELEMENT!';
}
if ($value === end($array)) {
echo 'LAST ITEM!';
}
}
So, if your array has unique array values, then determining last iteration is trivial:
foreach($array as $element) {
if ($element === end($array))
echo 'LAST ELEMENT!';
}
As you see, this works if last element is appearing just once in array, otherwise you get a false alarm. In it is not, you have to compare the keys (which are unique for sure).
foreach($array as $key => $element) {
end($array);
if ($key === key($array))
echo 'LAST ELEMENT!';
}
Also note the strict coparision operator, which is quite important in this case.
Don't add a comma after the last value:
The array:
$data = ['lorem', 'ipsum', 'dolor', 'sit', 'amet'];
The function:
$result = "";
foreach($data as $value) {
$resut .= (next($data)) ? "$value, " : $value;
}
The result:
print $result;
lorem, ipsum, dolor, sit, amet
You can still use that method with associative arrays:
$keys = array_keys($array);
for ($i = 0, $l = count($array); $i < $l; ++$i) {
$key = $array[$i];
$value = $array[$key];
$isLastItem = ($i == ($l - 1));
// do stuff
}
// or this way...
$i = 0;
$l = count($array);
foreach ($array as $key => $value) {
$isLastItem = ($i == ($l - 1));
// do stuff
++$i;
}
Assuming you have the array stored in a variable...
foreach($array as $key=>$value)
{
echo $value;
if($key != count($array)-1) { echo ", "; }
}
If you need to do something for every element except either the first or the last and only if there is more than one element in the array, I prefer the following solution.
I know there are many solutions above and posted months/one year before mine, but this is something I feel is fairly elegant in its own right. The check every loop is also a boolean check as opposed to a numeric "i=(count-1)" check, which may allow for less overhead.
The structure of the loop may feel awkward, but you can compare it to the ordering of thead (beginning), tfoot (end), tbody (current) in HTML table tags.
$first = true;
foreach($array as $key => $value) {
if ($first) {
$first = false;
// Do what you want to do before the first element
echo "List of key, value pairs:\n";
} else {
// Do what you want to do at the end of every element
// except the last, assuming the list has more than one element
echo "\n";
}
// Do what you want to do for the current element
echo $key . ' => ' . $value;
}
For instance, in web development terms, if you want to add a border-bottom to every element except the last in an unordered list (ul), then you can instead add a border-top to every element except the first (the CSS :first-child, supported by IE7+ and Firefox/Webkit supports this logic, whereas :last-child is not supported by IE7).
You can feel free to reuse the $first variable for each and every nested loop as well and things will work just fine since every loop makes $first false during the first process of the first iteration (so breaks/exceptions won't cause issues).
$first = true;
foreach($array as $key => $subArray) {
if ($first) {
$string = "List of key => value array pairs:\n";
$first = false;
} else {
echo "\n";
}
$string .= $key . '=>(';
$first = true;
foreach($subArray as $key => $value) {
if ($first) {
$first = false;
} else {
$string .= ', ';
}
$string .= $key . '=>' . $value;
}
$string .= ')';
}
echo $string;
Example output:
List of key => value array pairs:
key1=>(v1_key1=>v1_val1, v1_key2=>v1_val2)
key2=>(v2_key1=>v2_val1, v2_key2=>v2_val2, v2_key3=>v2_val3)
key3=>(v3_key1=>v3_val1)
This should be the easy way to find the last element:
foreach ( $array as $key => $a ) {
if ( end( array_keys( $array ) ) == $key ) {
echo "Last element";
} else {
echo "Just another element";
}
}
Reference : Link
I have a strong feeling that at the root of this "XY problem" the OP wanted just implode() function.
As your intention of finding the EOF array is just for the glue. Get introduced to the below tactic. You need not require the EOF:
$given_array = array('column1'=>'value1',
'column2'=>'value2',
'column3'=>'value3');
$glue = '';
foreach($given_array as $column_name=>$value){
$where .= " $glue $column_name = $value"; //appending the glue
$glue = 'AND';
}
echo $where;
o/p:
column1 = value1 AND column2 = value2 AND column3 = value3
How about using "end"?
http://php.net/manual/en/function.end.php
It sounds like you want something like this:
$array = array(
'First',
'Second',
'Third',
'Last'
);
foreach($array as $key => $value)
{
if(end($array) === $value)
{
echo "last index!" . $value;
}
}
$array = array("dog", "rabbit", "horse", "rat", "cat");
foreach($array as $index => $animal) {
if ($index === array_key_first($array))
echo $animal; // output: dog
if ($index === array_key_last($array))
echo $animal; // output: cat
}
you can do a count().
for ($i=0;$i<count(arr);$i++){
$i == count(arr)-1 ? true : false;
}
or if you're looking for ONLY the last element, you can use end().
end(arr);
returns only the last element.
and, as it turns out, you CAN index php arrays by integers. It's perfectly happy with
arr[1];
You could also do something like this:
end( $elements );
$endKey = key($elements);
foreach ($elements as $key => $value)
{
if ($key == $endKey) // -- this is the last item
{
// do something
}
// more code
}
I kinda like the following as I feel it is fairly neat. Let's assume we're creating a string with separators between all the elements: e.g. a,b,c
$first = true;
foreach ( $items as $item ) {
$str = ($first)?$first=false:", ".$item;
}
Here's my solution:
Simply get the count of your array, minus 1 (since they start in 0).
$lastkey = count($array) - 1;
foreach($array as $k=>$a){
if($k==$lastkey){
/*do something*/
}
}
foreach ($array as $key => $value) {
$class = ( $key !== count( $array ) -1 ) ? " class='not-last'" : " class='last'";
echo "<div{$class}>";
echo "$value['the_title']";
echo "</div>";
}
Reference
If it is a single dimensional array you can do this to keep it short and sweet:
foreach($items as $idx => $item) {
if (!isset($items[$idx+1])) {
print "I am last";
}
}
Here's another way you could do it:
$arr = range(1, 10);
$end = end($arr);
reset($arr);
while( list($k, $v) = each($arr) )
{
if( $n == $end )
{
echo 'last!';
}
else
{
echo sprintf('%s ', $v);
}
}
If I understand you, then all you need is to reverse the array and get the last element by a pop command:
$rev_array = array_reverse($array);
echo array_pop($rev_array);
You could also try this to make your query... shown here with INSERT
<?php
$week=array('one'=>'monday','two'=>'tuesday','three'=>'wednesday','four'=>'thursday','five'=>'friday','six'=>'saturday','seven'=>'sunday');
$keys = array_keys($week);
$string = "INSERT INTO my_table ('";
$string .= implode("','", $keys);
$string .= "') VALUES ('";
$string .= implode("','", $week);
$string .= "');";
echo $string;
?>
For SQL query generating scripts, or anything that does a different action for the first or last elements, it is much faster (almost twice as fast) to avoid using unneccessary variable checks.
The current accepted solution uses a loop and a check within the loop that will be made every_single_iteration, the correct (fast) way to do this is the following :
$numItems = count($arr);
$i=0;
$firstitem=$arr[0];
$i++;
while($i<$numItems-1){
$some_item=$arr[$i];
$i++;
}
$last_item=$arr[$i];
$i++;
A little homemade benchmark showed the following:
test1: 100000 runs of model morg
time: 1869.3430423737 milliseconds
test2: 100000 runs of model if last
time: 3235.6359958649 milliseconds
Another way to go is to remember the previous loop cycle result and use that as the end result:
$result = $where = "";
foreach ($conditions as $col => $val) {
$result = $where .= $this->getAdapter()->quoteInto($col.' = ?', $val);
$where .= " AND ";
}
return $this->delete($result);