PHP Array values in string?

Question

I have been looking around for a while in the PHP manual and can't find any command that does what I want.

I have an array with Keys and Values, example:

$Fields = array("Color"=>"Bl","Taste"=>"Good","Height"=>"Tall");

Then I have a string, for example:

$Headline = "My black coffee is cold";

Now I want to find out if any of the array ($Fields) values match somewhere in the string ($Headline).

Example:

Array_function_xxx($Headline,$Fields);

Would give the result true because "bl" is in the string $Headline (as a part of "Black").

I'm asking because I need performance... If this isn't possible, I will just make my own function instead...

EDIT - I'm looking for something like stristr(string $haystack , array $needle);

Thanks

SOLUTION - I came up with his function.

function array_in_str($fString, $fArray) {

  $rMatch = array();

  foreach($fArray as $Value) {
    $Pos = stripos($fString,$Value);
    if($Pos !== false)
      // Add whatever information you need
      $rMatch[] = array( "Start"=>$Pos,
                         "End"=>$Pos+strlen($Value)-1,
                         "Value"=>$Value
                       );
  }

  return $rMatch;
}

The returning array now have information on where each matched word begins and ends.

Ok, some questions: 1) what are possible values within $Fields array? 2) Do you need case insensitive search? — Tadeck
– Tadeck, Commented May 8, 2011 at 13:27
Case insensitive and the values are user inputs (say no more :) — Max Kielland
– Max Kielland, Commented May 8, 2011 at 14:05

Tadeck · Accepted Answer · 2011-05-08 13:42:38Z

5

This should help:

function Array_function_xxx($headline, $fields) {
    $field_values = array_values($fields);
    foreach ($field_values as $field_value) {
        if (strpos($headline, $field_value) !== false) {
            return true; // field value found in a string
        }
    }
    return false; // nothing found during the loop
}

Replace name of the function with what you need.

EDIT:

Ok, alternative solution (probably giving better performance, allowing for case-insensitive search, but requiring proper values within $fields parameter) is:

function Array_function_xxx($headline, $fields) {
    $regexp = '/(' . implode('|',array_values($fields)) . ')/i';
    return (bool) preg_match($regexp, $headline);
}

edited May 8, 2011 at 13:42

answered May 8, 2011 at 13:20

Tadeck

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4 Comments

Max Kielland Over a year ago

I take this as there is no such function in the PHP libraries. Yea, my next step was to do a function instead, but You already made one for me, thanks. I will modifie it to fit my purposes better, thank you.

Tadeck Over a year ago

You are welcome. If you know exactly what are the possible values within the $Fields array (eg. not empty and consisting only from lowercase and uppercase letters) and that the number of elements in $Fields array won't be very big, you can just construct regular expression (eg. allowing case-insensitive matches) and use it within preg_match() function. I believe it may give you better performance.

bueltge Over a year ago

I think the reges is better with $regexp = '~(' . implode( '|', array_values( $array ) ) . ')~iU';. This works also with strings are / and count values.

Tadeck Over a year ago

@bueltge: This comes to deciding what kind of values we could expect within $array, and this becomes more complex. First of all, you could possibly see some values containing ~ also. Secondly, the values themselves may contain some meta characters, especially some escape sequences. That second case should be addressed with preg_quote() or something similar - it will escape special characters.

afarazit · Accepted Answer · 2011-05-08 13:07:15Z

1

http://www.php.net/manual/en/function.array-search.php that's what you looking for

example from php.net

<?php
$array = array(0 => 'blue', 1 => 'red', 2 => 'green', 3 => 'red');

$key = array_search('green', $array); // $key = 2;
$key = array_search('red', $array);   // $key = 1;
?>

answered May 8, 2011 at 13:07

afarazit

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6 Comments

No Results Found Over a year ago

Sorry, I initially downvoted because your original answer was just a link to the array search docs with no explanation of how to use it. It's locked in now.

Max Kielland Over a year ago

The down vote is not from me, but consider a function like this: array_in_str("My long string with many words",array("word","number")); This will get a match because "word" is a part of "words".

afarazit Over a year ago

alright, check our array_search() i think that's the function you looking fore

JohnP Over a year ago

@wesley you can remove the downvote if @atno makes an edit. The edit has to be made about 5 minutes after the post though. It won't count otherwise

No Results Found Over a year ago

@JohnP: It won't let me because the post was edited during the grace period.

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