I have 2 to 3 strings.
example 1:
$a1 = 'a & b & c';
$a2 = 'b & c';
$a3 = 'c & a & b';
I want the common values as a delimited string.
$result = 'b & c'
If there are no intersections, the result should be an empty string.
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1Related: I want to compare two comma delimited strings in PHP and keep only the values that appear in both and PHP find if numbers contained in a string are present in another string and Efficient way to compare strings and get unique value and Php compare strings and return common valuesmickmackusa– mickmackusa ♦2025-08-12 13:39:08 +00:00Commented Aug 12 at 13:39
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3 Answers
An approach using array_intersect in combination with explode, implode and array_map:
$a1 = 'a & b & c';
$a2 = 'b & c';
$a3 = 'a & b & c';
$result = implode(' & ',
call_user_func_array('array_intersect',
array_map(function($a) {
return explode(' & ', $a);
},
[$a1, $a2, $a3])
)
);
echo($result);
Or if you want to pass in an array directly:
$arr = ['a & b & c', 'b & c', 'a & b & c'];
$result = implode(' & ',
call_user_func_array('array_intersect',
array_map(function($a) {
return explode(' & ', $a);
},
$arr)
)
);
echo($result);
answered Jan 24, 2017 at 6:36
Robby Cornelissen
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6 Comments
khan Asim
hi there if i have an array for that what can i do like Array ( [0] => a & b & c [1] => a & b [2] => b [3] => a & b & c )
Robby Cornelissen
It's the same. I'm passing in array
[$a1, $a2, $a3] in my method.khan Asim
Can u show me that i am unable to do that can u please help me in that with passing an array as $arr
Robby Cornelissen
Just pass in
$arr instead of [$a1, $a2, $a3].khan Asim
i am getting a parse error Parse error: syntax error, unexpected T_FUNCTION, expecting ')'
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Use Array Intersect and unique for it
<?php
$a1 = 'a & b & c';
$a2 = 'b & c';
$a3 = 'a & b & c';
$pieces1 = str_word_count($a1, 1);
$pieces2 = str_word_count($a2, 1);
$pieces3 = str_word_count($a3, 1);
$result=array_intersect(array_unique($pieces1), array_unique($pieces2),array_unique($pieces3));
print_r ($result);
?>
o/p
Array ( [1] => b [2] => c )
Comments
For a dynamic script which can process any number of strings, pass your input data as a single array to the below. Use the spread operator to compare all sets of the exploded strings at once.
In short, explode all strings, retain all intersections, implode all survivors. Demo
echo implode(
' & ',
array_intersect(
...array_map(
fn($a) => explode(' & ', $a),
[$a1, $a2, $a3]
)
)
);
// b & c
Comments
