Remove every row where entry equal an empty string - php

Question

I have an array with several rows containing those values (id,date,latlng,transport). I want to remove the entire row when transport = "".
I tried while, for and foreach but the problem is : when I find more than 1 entry to delete, the "$i" doesn't match anymore with the appropriate row.
for($i=0;$i<count($json_a[data][entrees]);$i++)
{
if($json_a[data][entrees][$i][transport]!="")
{
array_splice($json_a[data][entrees],$i,1);
//first removal is OK. Second won't scope the good row
}
}
I managed to make it work by creating a second array and copying the good rows inside, then replacing the first array. But there are probably better solutions, aren't they ?

Answer 1

there is no $i in a foreach loop.
foreach($json_a['data']['entrees'] as $entryKey => $entry){
if($entry['transport']!=""){
unset($json_a['data']['entrees'][$entryKey]);
}
}

Answer 2

for($i=0;$i<count($json_a[data][entrees]);$i++)
{
if($json_a[data][entrees][$i][transport]=="")
{
unset($json_a[data][entrees][$i]);
}
}
print_r($json_a[data][entrees])
Hope this helps!

Answer 3

Try this:
foreach( $json_a['data']['entrees'] as $key => $entry ){
if( $entry['transport'] != "" ){
array_splice($json_a['data']['entrees'], $key, 1);
}else{
unset($json_a['data']['entrees'][$key]);
}
}

Answer 4

You are using PHP array_splice where it reads:
Remove a portion of the array and replace it with something else
To remove one entry from an Array, you should use PHP unset where it reads:
Unset a given variable.
So, your code should be:
<?php
for($i=0;$i<count($json_a[data][entrees]);$i++)
{
if($json_a[data][entrees][$i][transport]!="")
{
//remove this entry from the array
unset($json_a[data][entrees][$i]);
}
}
?>
Test Case:
// Sample Array with 4 entries
$json_a = array(
"data" => array (
"entrees" => array(
array (
"id" => 14,
"date" => '2012-06-14',
"latlng" => '14.000000, -9.00000',
"transport" => ''
),
array(
"id" => 13,
"date" => '2012-06-14',
"latlng" => '13.000000, -8.00000',
"transport" => '12'
),
array(
"id" => 12,
"date" => '2012-06-14',
"latlng" => '12.000000, -7.00000',
"transport" => '45'
),
array(
"id" => 11,
"date" => '2012-06-14',
"latlng" => '11.000000, -6.00000',
"transport" => ''
)
)
)
);
Control Output:
var_dump($json_a);
Outputs:
array(1) { ["data"]=> array(1) { ["entrees"]=> array(4) { [0]=> array(4) { ["id"]=> int(14) ["date"]=> string(10) "2012-06-14" ["latlng"]=> string(19) "14.000000, -9.00000" ["transport"]=> string(0) "" } 1=> array(4) { ["id"]=> int(13) ["date"]=> string(10) "2012-06-14" ["latlng"]=> string(19) "13.000000, -8.00000" ["transport"]=> string(2) "12" } 2=> array(4) { ["id"]=> int(12) ["date"]=> string(10) "2012-06-14" ["latlng"]=> string(19) "12.000000, -7.00000" ["transport"]=> string(2) "45" } [3]=> array(4) { ["id"]=> int(11) ["date"]=> string(10) "2012-06-14" ["latlng"]=> string(19) "11.000000, -6.00000" ["transport"]=> string(0) "" } } } }
Run the Cycle:
for($i=0;$i<count($json_a[data][entrees]);$i++)
{
if($json_a[data][entrees][$i][transport]!="")
{
//remove this entry from the array
unset($json_a[data][entrees][$i]);
}
}
Confirmation Output:
var_dump($json_a);
Outputs:
array(1) { ["data"]=> array(1) { ["entrees"]=> array(2) { [0]=> array(4) { ["id"]=> int(14) ["date"]=> string(10) "2012-06-14" ["latlng"]=> string(19) "14.000000, -9.00000" ["transport"]=> string(0) "" } [3]=> array(4) { ["id"]=> int(11) ["date"]=> string(10) "2012-06-14" ["latlng"]=> string(19) "11.000000, -6.00000" ["transport"]=> string(0) "" } } } }