I want to generate a selectbox using two arrays, one containing the country codes and another containing the country names.
This is an example:
<?php
$codes = array('tn','us','fr');
$names = array('Tunisia','United States','France');
foreach( $codes as $code and $names as $name ) {
echo '<option value="' . $code . '">' . $name . '</option>';
}
?>
This method didn't work for me. Any suggestions?
There are 2 ways of doing this
foreach($questions as $key => $question){
$questions[$key]['answers'] = $answers_model->get_answers_by_question_id($question['question_id']);
}
This way you save the key, so you can update it again in the main $questions variable
or
foreach($questions as &$question){
Adding the & will keep the $questions updated. But I would say the first one is recommended even though this is shorter (see comment by Paystey)
Per the PHP foreach documentation:
In order to be able to directly modify array elements within the loop precede $value with &. In that case the value will be assigned by reference.
You're in fact keeping (or trying to keep) two distinct copies of the whole dataset in your memory. First you load the whole CSV date into memory using getData() and the you copy the data into the $data array by looping over the data in memory and creating a new array.
You should use stream based reading when loading the CSV data to keep just one data set in memory. If you're on PHP 5.5+ (which you definitely should by the way) this is a simple as changing your getData method to look like that:
protected function getData($file) {
if (!file_exists($file)) {
throw new Exception('File "' . $file . '" do not exists');
}
$fh = fopen($file, 'r');
while ($rowData = fgetcsv($fh, $this->_lineLength, $this->_delimiter, $this->_enclosure)) {
yield $rowData;
}
fclose($fh);
}
This makes use of a so-called generator which is a PHP >= 5.5 feature. The rest of your code should continue to work as the inner workings of getData should be transparent to the calling code (only half of the truth).
UPDATE to explain how extracting the column headers will work now.
$data = array();
$csvData = $this->getData($file);
if ($columnNames) { // don't know what this one does exactly
$columns = null;
foreach ($csvData as $keyIndex => $rowData) {
if ($keyIndex === 0) {
$columns = $rowData;
} else {
$data[$keyIndex/* -1 if you need 0-index */] = array_combine(
$columns,
array_values($rowData)
);
}
}
}
return $data;
This should work for you:
Just array_reduce() your array into a one dimensional array.
$result = array_reduce($arr, "array_merge", [])
EDIT:
To get your result you have to rewrite your code a bit, so that you collect all values into one array by go throw all elements of $linkObjs with array_map().
$linkObjs = $html->find('h3.r a');
$i = count($linkObjs);
$result = array_map(function($v){
return trim($v->plaintext);
}, $linkObjs);
print_r($result);
You need to iterate the elements from the inside array, like this:
foreach($resultArray as $row => $innerArray){
foreach($innerArray as $innerRow => $value){
echo $value . "<br/>";
}
}
That is not valid.
You probably want something like this...
Alternatively, it'd be much easier to make the codes the key of your
$namesarray...