I have been trying to get this code to work for ages now and have looked at other questions but it is not working for me. Any guidance is greatly appreciated.
In context, there is a sql query to bring back all of the results for today's entries. These are converted to a CSV file every day. To import into the software then the end of each row must return "" and a carriage return except the last row which should not add a carriage return.
The code is below:
$xo1 = "\"\"";
$xo2 = "\r\n";
while ($row = mysql_fetch_array($sql)) {
for ($i = 0; $i < $columns_total; $i++) {
$output .='"'.$row["$i"].'",';
if(++$i === $columns_total){
$xo1 = "";
$xo2 = "";}
}
$output .= $xo1;
$output .= $xo2;
}
I guess rtrim() should do the job, if I got the question right.
while ( $row = mysql_fetch_array( $sql ) ) {
foreach( $row as $column ) {
$output .= sprintf( '"%s",""' . "\r\n" , $column );
}
}
rtrim( $output, '""' . "\r\n" );
You can also use the index of the loop for this problem. When index is above zero apply the $xo1 and $xo2. For example:
for ($i = 0; $i < $columns_total; $i++) {
if ( $i > 0 ) {
$output .= $xo1 . $xo2;
}
// now apply other workings
$output .='"'.$row["$i"].'",';
}
Is there any way to add an increment value while imploding an array?
This is the piece of code I'd like to have the increment value:
$entries = '<ul class="repeatData"><li class="listEntry1">' . implode('</li><li class="listEntry'. $countme .'">', $data) . '</li></ul>';
I'd like somehow to make the variable $countme increment every time it implodes each array value, if this is even possible.
You cannot do this with implode, but look into applying an anonymous function to the array. You can probably do what you want with not much more code.
$entries = '<ul class="repeatData">';
$countme = 1;
array_walk($data, function ($element) use (&$entries, &$countme) {
$entries .= '<li class="listEntry'. $countme .'">'. $element . '</li>';
$countme++;
});
$entries .= "</ul>";
Explanation: I have written an anonymous function, told it about $entries and $counter (so it is a closure, in fact) so that it can modify them from inside its scope, and passed it to array_walk, which will apply it to all elements of the array.
There is no built in function for that. You have to write your own:
This function generalizes the problem and takes an array of glues and the data as arguments. You may refine it to fit more to your needs...
function custom_implode($glues, $pieces) {
$result = '';
while($piece = array_shift($pieces)) {
$result .= $piece;
$glue = array_shift($glues);
if(!empty($pieces)) {
$result .= $glue;
}
}
return $result;
}
Usage:
$glues = array();
for($i = 0; $i < $end; $i++) {
$glues []= '</li><li class="listEntry'. $i .'">';
}
echo custom_implode($glues, $data);
You can save the for loop which populates $glues if you customize the function a little bit more:
function custom_implode($start, $pieces) {
$result = '';
$counter = $start;
while($piece = array_shift($pieces)) {
$result .= $piece;
if(!empty($pieces)) {
$result .= '</li><li class="listEntry'. $counter .'">';
}
}
return $result;
}
To expand upon #ravloony's answer, you can use a mapping function with a counter to produce what you want, the following function could assist.
function implode_with_counter($glue, $array, $start, $pattern) {
$count = $start;
$str = "";
array_walk($array, function($value) use ($glue, $pattern, &$str, &$count) {
if (empty($str)) {
$str = $value;
} else {
$str = $str . preg_replace('/' . preg_quote($pattern, '/') . '/', $count, $glue) . $value;
$count++;
}
});
return $str;
}
Example use:
echo implode_with_counter(' ([count]) ', range(1,5), 1, '[count]');
// Output: 1 (1) 2 (2) 3 (3) 4 (4) 5
For your case:
$entries = '<ul class="repeatData"><li class="listEntry1">'
. implode_with_counter('</li><li class="listEntry[countme]">', $data, 2, '[countme]')
. '</li></ul>';
Update: Alternative
An alternative approach is to just implement a callback version of implode(), and provide a function. Which is a little more universally usable, than the pattern matching.
function implode_callback($callback, array $array) {
if (!is_callable($callback)) {
throw InvalidArgumentException("Argument 1 must be a callable function.");
}
$str = "";
$cIndex = 0;
foreach ($array as $cKey => $cValue) {
$str .= ($cIndex == 0 ? '' : $callback($cKey, $cValue, $cIndex)) . $cValue;
$cIndex++;
}
return $str;
}
Example use:
echo implode_callback(function($cKey, $cValue, $cIndex) {
return ' (' . $cIndex . ') ';
}, range(1,5));
// Output: 1 (1) 2 (2) 3 (3) 4 (4) 5
Your case:
$entries = '<ul class="repeatData"><li class="listEntry1">'
. implode_callback(function($cKey, $cValue, $cIndex) {
return '</li><li class="listEntry' . ($cIndex + 1) . '">';
}, $data)
. '</li></ul>';
No, implode doesn't work that way.
You will need to create your own function to do that.
You should also consider if this is what you really need. In both Javascript and CSS you can easily reference the n-th child of a node if you need to do that.
Would you please give me some guidance on how to style one character in a string at specific index? the index of this string comes from an array and in some cases the array is empty, so I only need to style the character in the string if the array is not empty
$indices = array(74, 266);
$string = "CAGGACACTCTTTCTAGTGTTGATTCACCTCGAAGAAGGTCTGGCCTATTAAGAGATCAAGTTCAGTTGGTAAAAAGAAGCAACTCTGCTCGTTATGAGATAGTCCCGATTCAAGATCAACTATCATTTGAGAAGGGTTTCTTTATTGTAATCCGTGCATGCCAGTTGTTGGCTCAGAAGAATGAAGGCATTGTACTGGTGGGAGTCGCTGGTCCTTCAGGGGCCGGAAAGACCATGTTTACAGAAAAGATCCTGAATGTTATGCCTAGTATTGCAATCATAAACATGGACAACTACAATGATCCCAGTCGTATCATTGATGGAAACTTCGACG";
so how do I add a surround the character at the index 74 and 266 with a span so I can give it a different style?
my data is coming from the database so I need to make it dynamic.
Thanks
It's fairly easy: all you need is a few substrs in a loop and to keep track of the character count.
Here's a working code I made:
// zero-based indices
$indices = array(3, 10, 25);
// input
$in = 'abcDefghijKlmnopqrstuvwxyZ';
$openTag = '<b>';
$closeTag = '</b>';
$out = '';
$last = 0;
foreach($indices as $i) {
$fragment = substr($in, $last, $i-$last);
$letter = substr($in, $i, 1);
$last = $i+1;
$out .= $fragment . $openTag . $letter . $closeTag;
}
$out .= substr($in, $last);
// output
echo $out;
For this example, $out is abc<b>D</b>efghij<b>K</b>lmnopqrstuvwxy<b>Z</b>.
For convenience, here's it also as a function:
function highlightChars($text, $indices, $openTag, $closeTag) {
$out = '';
$last = 0;
foreach($indices as $i) {
$fragment = substr($text, $last, $i-$last);
$letter = substr($text, $i, 1);
$last = $i+1;
$out .= $fragment . $openTag . $letter . $closeTag;
}
$out .= substr($text, $last);
return $out;
}
I'm using a foreach loop to echo out some values from my database, I need to strip the last comma from the last loop if that makes sense.
My loop is just simple, as below
foreach($results as $result){
echo $result->name.',';
}
Which echos out
result,result,result,result,
I just need to kill that pesky last comma.
Better:
$resultstr = array();
foreach ($results as $result) {
$resultstr[] = $result->name;
}
echo implode(",",$resultstr);
1. Concat to string but add | before
$s = '';
foreach ($results as $result) {
if ($s) $s .= '|';
$s .= $result->name;
}
echo $s;
2. Echo | only if not last item
$s = '';
$n = count($results);
foreach ($results as $i => $result) {
$s .= $result->name;
if (($i+1) != $n) $s .= '|';
}
echo $s;
3. Load to array and then implode
$s = array();
foreach ($results as $result) {
$s[] = $result->name;
}
echo implode('|', $s);
4. Concat to string then cut last | (or rtrim it)
$s = '';
foreach ($results as $result) {
$s .= $result->name . '|';
}
echo substr($s, 0, -1); # or # echo rtrim($s, '|');
5. Concat string using array_map()
echo implode('|', array_map(function($result) { return $result->name; }, $results));
$result_names = '';
foreach($results as $result){
$result_names .= $result->name.',';
}
echo rtrim($result_names, ',');
I've been having the same issue with this similar problem recently. I fixed it by using an increment variable $i, initializing it to 0, then having it increment inside the foreach loop. Within that loop place an if, else, with the echo statement including a comma if the $i counter is less than the sizeof() operator of your array/variable.
I don't know if this would fix your issue per se, but it helped me with mine. I realize this question is years-old, but hopefully this will help someone else. I'm fairly new to PHP so I didn't quite understand a lot of the Answers that were given before me, though they were quite insightful, particularly the implode one.
$i=0;
foreach ($results as $result) {
$i++;
if(sizeof($results) > $i) {
echo $result . ", ";
} else {
echo $result;
}
}
In modern PHP, array_column() will allow you to isolate a column of data within an array of objects.
Code: (Demo)
$results = [
(object)['name' => 'A'],
(object)['name' => 'B'],
(object)['name' => 'C']
];
echo implode(',', array_column($results, 'name'));
Output:
A,B,C
That said, since you are iterating a result set, then you may be better served by calling a CONCAT() function in your sql, so that the values are already joined in the single value result set.
If you are processing a collection in Laravel, you can pluck() and implode():
$collection->pluck('name')->implode(',')
$arraySize = count($results);
for($i=0; $i<$arraySize; $i++)
{
$comma = ($i<$arraySize) ? ", " : "";
echo $results[$i]->name.$comma;
}
Not as pretty, but also works:
$first=true;
foreach($results as $result){
if(!$first) { echo ', '; }
$first=false;
echo $result->name;
}
Another smart way is:
foreach($results as $result){
echo ($passed ? ',' : '') . $result->name;
$passed = true;
}
In this case at first loop $passed is NULL and , doesn't print.
I know this is an old thread, but this came up recently and I thought I'd share my alternate, cleaner way of dealing with it, using next().
$array = array("A thing", "A whatsit", "eighty flange oscillators");
foreach( $array as $value ){
echo $value;
$nxt = next($array);
if($nxt) echo ", "; // commas between each item in the list
else echo ". And that's it."; // no comma after the last item.
}
// outputs:
// A thing, A whatsit, eighty flange oscillators. And that's it.
play with it here
I have to do this alot because I'm always trying to feed numbers in to jplot, I find its easier to put the comma in the front of the loop like so:
foreach($arrayitem as $k){ $string = $string.",".$k;
}
and then chop off the first character (the comma) using substr, it helps if you know a guestimate of long your string will be, I'm not sure what the limit on substr max character is.
echo substr($a,1,10000000);
hope this helps.
$a[0] = 'John Doe';
$a[1] = 'Jason statham';
$a[2] = 'Thomas Anderson';
$size = count($a);
foreach($a as $key=>$name){
$result .= $name;
if($size > $key+1) $result .=', ';
}
echo $result;
<?php
$return = array(any array)
$len = count($return);
$str = '';
$i = 1;
foreach($return as $key=>$value)
{
$str .= '<a href='.$value['cat_url'].'>'.$value['cat_title'].'</a>';
if($len > $i)
{
$str .= ',';
$i = $i+1;
}
}
echo $str;
?>
<?php
$i = 1;
$count = count( $results );
foreach( $results as $result ) {
echo $result->name;
if ( $i < $count ) echo ", ";
++$i;
}
?>
This is what I normally do, add a comma before the item rather than after, while ignoring the first loop.
$i = 0;
$string = '';
foreach($array as $item){
$string .= ($i++ ? ',' : '').$item;
}
First get all the output by using output buffering. Then, trim the comma and display it. So, do it like this:
ob_start();
foreach($results as $result)
{
echo $result->name.',';
}
$output = ob_get_clean();
echo rtrim($output, ',');
The output buffering method helps if the inside loop is very big (and OP is posting here just for brevity), then using OB is easier without changing the internals of the loop.
Hi i am trying to use simple_html_dom for a text(website) clustering project but i have run into a weird problem. When i use echo inside the outer loop the url and the snippet are what you would expect but when i try to echo the array contents i have gathered outside the loop the urls are ok but the snippets are gone and the last snippet is in their place.
<?php
// create HTML DOM
include("simple_html_dom.php");
$search_query = 'something';
$j = 1;
$k = 1;
/*************************GOOGLE***************************/
for ($i = 0; $i < 1; $i++) {
$url = sprintf('http://www.google.com/search?q=%s&start=%d', $search_query, 10 * $i);
$html = file_get_html($url);
foreach ($html->find('a[class=l]') as $element) {
$urls[$j] = $element->href;
echo $element->href . "\n\n\n\n\n";
$j++;
}
foreach ($html->find('div[class=s]') as $element) {
$snippets[$k] = $element->innertext;
echo $element->innertext . "\n\n\n\n\n";
$k++;
}
}
$j = 1;
foreach ($snippets as $elemement) {
echo $urls[$j] . "\n" . $element . "\n\n\n\n";
$j++;
}
?>
Are you sure you did not made a typo in your code?
foreach ($snippets as $elemement) {
echo $urls[$j] . "\n" . $element . "\n\n\n\n";
$j++;
}
element and elemement are different; Your loop executes fine but your statement probably doesn't.
You made a typo, $elemenent really should be $element.
foreach ($snippets as $element) {
echo $urls[$j] . "\n" . $element . "\n\n\n\n";
$j++;
}
This is one reason to get used to make readable code. It's not because others like it, but because it makes debugging much easier.