foreach function for more than 2 array - php

Question

I need to insert data to a table.. the data come from different sources. The following are my code.
$title = array(Book A, Book B, Book C);
$number = array(2,1,4);
$lines = array(Maria, Smith, Abner);
for($i=1; $i<count($lines); $i++)
{
print '<tr>';
print '<td>'.$title[$i].'</td>';
print '<td>P'.$number[$i].'</td>';
print '<td>['.$lines[$i].']</td>';
print '<td></td>';
print '</tr>';
}
Seems not working :/ the array not display properly in my table.
I'm expecting output as follows:
------------------------------------------------
| Title | No | Lines | Remarks |
------------------------------------------------
| Book A | 2 | Maria | |
| Book B | 1 | Smith | |
| Book C | 4 | Abner | |
------------------------------------------------
at the moment.. I get the following output:
------------------------------------------------
| Title | No | Lines | Remarks |
------------------------------------------------
| Book A | 2 | Maria | |
| | | Smith | |
| | | Abner | |
------------------------------------------------

Answer 1

If your arrays has different keys you can 'reset' them to be zero-based. Just use $array = array_values($array). Quote from manual
array_values() returns all the values from the array and indexes the array numerically.
After this you code will work. This is how your example can be modified:
$title = array('Book A', 'Book B', 'Book C');
$number = array("a" => 2, "b" => 1, "c" => 4);
$lines = array('Maria', 'Smith', 7 => 'Abner');
/* At this point you have some arrays with unknown keys.
It can be [0 => item, 1 => item2] or ['name' => item, 'name2' => item2]
or even with skipped keys [0 => item, 7 => item2]
*/
// Reset keys for all arrays. Now all arrays will contain keys 0, 1, 2 etc.
$title = array_values($title);
$number = array_values($number);
$lines = array_values($lines);
for($i = 0; $i < count($lines); $i++) // Note, arrays now are zero-based, you must start from $i = 0
{
print '<tr>';
print '<td>'.$title[$i].'</td>';
print '<td>P'.$number[$i].'</td>';
print '<td>['.$lines[$i].']</td>';
print '<td></td>';
print '</tr>';
}

Answer 2

you just put i=0; because array started from 0 index and try following code may it help u.
<?php $title = array('Book A','Book B','BookC');$number = array('2','1','4');$lines = array('Maria','Smith','Abner');for($i=0;$i<count($lines); $i++){print '<tr>';print '<td>'.$title[$i].'</td>';print '<td>P'.$number[$i].'</td>';print'<td>['.$lines[$i].']</td>';print '<td></td>'; print '</tr>'; } ?>

Answer 3

There's a neat trick to merging separate arrays with array_map() if you pass null as the first argument, followed by the arrays you want merged.
As quoted in Example #4 in the docs:
An interesting use of this function is to construct an array of arrays, which can be easily performed by using NULL as the name of the callback function
Using your example for context:
<?php
$titles = ['Book A', 'Book B', 'Book C'];
$numbers = [2,1,4];
$lines = ['Maria', 'Smith', 'Abner'];
// create an 'array of arrays'
$rows = array_map(null, $titles, $numbers, $lines);
var_dump($rows);
Yields:
array (size=3)
0 =>
array (size=3)
0 => string 'Book A' (length=6)
1 => int 2
2 => string 'Maria' (length=5)
1 =>
array (size=3)
0 => string 'Book B' (length=6)
1 => int 1
2 => string 'Smith' (length=5)
2 =>
array (size=3)
0 => string 'Book C' (length=6)
1 => int 4
2 => string 'Abner' (length=5)
You can then iterate over it pretty easily, like so:
foreach ($rows as $row) {
list($title, $number, $line) = $row;
printf('<tr><td>%s</td><td>%s</td><td>%s</td></tr>',
$title, $number, $line);
}
This should give you something like:
<tr><td>Book A</td><td>2</td><td>Maria</td></tr>
<tr><td>Book B</td><td>1</td><td>Smith</td></tr>
<tr><td>Book C</td><td>4</td><td>Abner</td></tr>
A useful side-effect of this approach is that your arrays do not have to be the same length; null will be used where applicable to pad out any "missing" values.
Another quick example:
<?php
$letters = range('a', 'd'); // ['a', 'b', 'c', 'd']
$numbers = range(1, 3); // [1, 2, 3]
$merged = array_map(null, $letters, $numbers);
var_dump($merged);
Yields:
array (size=4)
0 =>
array (size=2)
0 => string 'a' (length=1)
1 => int 1
1 =>
array (size=2)
0 => string 'b' (length=1)
1 => int 2
2 =>
array (size=2)
0 => string 'c' (length=1)
1 => int 3
3 =>
array (size=2)
0 => string 'd' (length=1)
1 => null
Hope this helps :)

Answer 4

You can try modifying you code as follow:
foreach($lines as $z => $value)
{
print '<tr>';
print '<td>'.$title[$z].'</td>';
print '<td>P'.$number[$z].'</td>';
print '<td>['.$value.']</td>';
print '<td></td>';
print '</tr>';
}

Answer 5

I found that the array index for all my array is not in sequential.
eg: $title =
array[0] = Book A
array[5] = Book B
array[9] = Book C
So, that is probably the reason why it is not display accordingly. I cannot use function 'for'. However, I cannot re-number the index because its the key for me to continue with next module/function.
So, I tried the following code.. but seems something missing..
$i=0;
if (!empty($title)){
foreach($title as $key => $value){
$y = $number[$key];
if ($i<count($lines))
{ $z = $lines[$i];
$i+1;
}
print '<tr>';
print '<td>'.$value.'</td>';
print '<td>'.$y.'</td>';
print '<td>['.$z.']</td>';
print '<td></td>';
print '</tr>';
}
}
The following is the output that I get. Now array for $lines that didn't display properly.
------------------------------------------------
| Title | No | Lines | Remarks |
------------------------------------------------
| Book A | 2 | Maria | |
| Book B | 1 | Maria | |
| Book C | 4 | Maria | |
------------------------------------------------