I have csv[ ][ ]. How do I use a for each loop to unset data in rows?
for each ($index) {
if (conditions to meet) {
unset(csv[$index]);
}
}
-
foreach ($csv as $key => $value) { if (0 === strpos($csv[$key][0], 'bad')) { unset($csv[$key]); } } thank you :)Dio– Dio2015-07-12 05:20:44 +00:00Commented Jul 12, 2015 at 5:20
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2 Answers
Try this :
foreach ($csv as $key => $value) {
unset($csv[$key]);
}
Comments
http://docs.php.net/manual/en/control-structures.foreach.php says:
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.
That's what you should use to modify single elements of the rows when using two foreach loops.
<?php
$csv = [
[1,2,3,4,5],
[2,3,4,5,6],
[3,4,5,6,7],
[4,5,6,7,8],
];
// make $row a reference
// so that unset($row[...]) affects $csv and not only a "copy".
foreach( $csv as &$row ) {
foreach( $row as $key=>$column ) {
if ( 0===$column%2 ) { // e.g. remove all even elements
unset( $row[$key] );
}
}
}
var_export($csv);
prints
array (
0 =>
array (
0 => 1,
2 => 3,
4 => 5,
),
1 =>
array (
1 => 3,
3 => 5,
),
2 =>
array (
0 => 3,
2 => 5,
4 => 7,
),
3 =>
array (
1 => 5,
3 => 7,
),
)
Or (same output) without foreach loops.
<?php
$csv = [
[1,2,3,4,5],
[2,3,4,5,6],
[3,4,5,6,7],
[4,5,6,7,8],
];
$csv = array_map(
function($row) {
return array_filter(
$row,
function($col) {
return 0!==$col%2;
}
);
},
$csv
);
var_export($csv);
