Solved

# Remove element from an array.

Posted on 2007-03-28
825 Views
Cannot see the wood for the trees, so this is going to be some EASY points!

I have a dynamic array; i.e. at RUNTIME, values are added and removed.

\$a_Array[] = 'value';

By using in_array() I know if the value is already in the array.

How do I remove the value from the array? I have a stupidly convoluted way...

Get the key of the value and then unset that element.

<?php
\$a = array('one','two',4 => 'three', 3 => 'four'); // NOT a typo!!!!
unset(\$a[reset(array_keys(\$a, 'three', True))]);
var_export(\$a);
?>

This is OK, the output is ...

array (
0 => 'one',
1 => 'two',
3 => 'four',
)

but ...

Strict Standards: Only variables should be passed by reference on line 3

So, I suspect there is really a array_remove(&\$array, \$value) function SOMEWHERE.
0
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LVL 14

Accepted Solution

Aamir Saeed earned 167 total points
ID: 18807338
try something like

/**
* Remove a value from a array
* @param string \$val
* @param array \$arr
* @return array \$array_remval
*/
function array_remval(\$val, &\$arr)
{
\$array_remval = \$arr;
for(\$x=0;\$x<count(\$array_remval);\$x++)
{
\$i=array_search(\$val,\$array_remval);
if (is_numeric(\$i)) {
\$array_temp  = array_slice(\$array_remval, 0, \$i );
\$array_temp2 = array_slice(\$array_remval, \$i+1, count(\$array_remval)-1 );
\$array_remval = array_merge(\$array_temp, \$array_temp2);
}
}
return \$array_remval;
}

\$stack=Array('apple','banana','pear','apple', 'cherry', 'apple');
array_remval("apple", \$stack);

//output: Array('banana','pear', 'cherry')
0

LVL 11

Assisted Solution

elfe69 earned 167 total points
ID: 18807374
Using unset is the standard way to remove an item from an array according to the documentation:

http://ch2.php.net/types.array

0

LVL 27

Assisted Solution

Cornelia Yoder earned 166 total points
ID: 18807393
Use array_diff( ) or one of it's variations (depending on exactly how you want to specify the element to be removed).

http://us3.php.net/manual/en/function.array-diff.php

0

LVL 40

Author Comment

ID: 18807630
Doh.

Ok. That was WAY too easy!

/**
* array array_remove ( array input, mixed search_value [, bool strict] )
**/
function array_remove(array &\$a_Input, \$m_SearchValue, \$b_Strict = False)
{
\$a_Keys = array_keys(\$a_Input, \$m_SearchValue, \$b_Strict);
foreach(\$a_Keys as \$s_Key)
{
unset(\$a_Input[\$s_Key]);
}
return \$a_Input;
}
0

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