02-23-2006
Comma Seperated List of Values
Hi,
I have a comma seperated list of values:
export list="red,blue,white,yellow"
Given a value in a variable "look", i want to check whether the value is available in the above list. But the result should be based on exact string match and not part of the string.
I am using following command:
echo $list | grep $look
For Eg:
1. When look="red", the above command returns "red,blue,white,yellow". This is CORRECT as i consider the value is present.
2. When look="green", the above command returns "" (BLANK). This is CORRECT as i consider the value is not present.
3. When look="low", the above command returns "red,blue,white,yellow". This is WRONG as low is not word but part of the 'yellow' word. The result should ideally give me ""(BLANK).
Can anybody help me out to overcome my problem OR is there any better way to check whether a given exact word is present in a list.
TIA
Warm Regards,
Ramesh
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LEARN ABOUT PHP
array_diff_assoc
ARRAY_DIFF_ASSOC(3) 1 ARRAY_DIFF_ASSOC(3)
array_diff_assoc - Computes the difference of arrays with additional index check
SYNOPSIS
array array_diff_assoc (array $array1, array $array2, [array $...])
DESCRIPTION
Compares $array1 against $array2 and returns the difference. Unlike array_diff(3) the array keys are also used in the comparison.
PARAMETERS
o $array1
- The array to compare from
o $array2
- An array to compare against
o $...
- More arrays to compare against
RETURN VALUES
Returns an array containing all the values from $array1 that are not present in any of the other arrays.
EXAMPLES
Example #1
array_diff_assoc(3) example
In this example you see the "a" => "green" pair is present in both arrays and thus it is not in the output from the function.
Unlike this, the pair 0 => "red" is in the output because in the second argument "red" has key which is 1.
<?php
$array1 = array("a" => "green", "b" => "brown", "c" => "blue", "red");
$array2 = array("a" => "green", "yellow", "red");
$result = array_diff_assoc($array1, $array2);
print_r($result);
?>
The above example will output:
Array
(
[b] => brown
[c] => blue
[0] => red
)
Example #2
array_diff_assoc(3) example
Two values from key => value pairs are considered equal only if (string) $elem1 === (string) $elem2 . In other words a strict check
takes place so the string representations must be the same.
<?php
$array1 = array(0, 1, 2);
$array2 = array("00", "01", "2");
$result = array_diff_assoc($array1, $array2);
print_r($result);
?>
The above example will output:
Array
(
[0] => 0
[1] => 1
)
NOTES
Note
This function only checks one dimension of a n-dimensional array. Of course you can check deeper dimensions by using, for example,
array_diff_assoc($array1[0], $array2[0]);.
Note
Ensure you pass arguments in the correct order when comparing similar arrays with more keys. The new array should be the first in
the list.
SEE ALSO
array_diff(3), array_diff_uassoc(3), array_udiff_assoc(3), array_udiff_uassoc(3), array_intersect(3), array_intersect_assoc(3).
PHP Documentation Group ARRAY_DIFF_ASSOC(3)