substr() function for array PHP

Question

I have a code that will produce array of strings.... now my problem is i need to substr each result of the array but i think array is not allowed to be used in substr...

please help:

CODE:

<?php
$file = 'upload/filter.txt';
$searchfor = $_POST['search'];
$btn = $_POST['button'];
$sum = 0;

if($btn == 'search') {

//prevents the browser from parsing this as HTML.
header('Content-Type: text/plain');

// get the file contents, assuming the file to be readable (and exist)
$contents = file_get_contents($file);

// escape special characters in the query
$pattern = preg_quote($searchfor, '/');

// finalise the regular expression, matching the whole line
$pattern = "/^.*$pattern.*\$/m";


// search, and store all matching occurences in $matches
if(preg_match_all($pattern, $contents, $matches)){
echo "Found matches:\n";
$result = implode("\n", $matches[0]);
echo $result;


 }
else{
 echo "No matches found";
 }


 }
 ?>

The $matches there is the array... i need to substr each result of the $matches

To apply a function to all items in an array use array_map (returns a new array) or array_walk (can mutate items in the original array). — Jon
– Jon, Commented Sep 5, 2013 at 7:51
first thing your question is not clear, On which array you to use substr. Have you tried? . Good solution for any array to apply function is array_map — Sunil Kumar
– Sunil Kumar, Commented Sep 5, 2013 at 7:51
hi @Jon thanks for your reply... can you give a sample code if you dont mind :3 — Bongsky
– Bongsky, Commented Sep 5, 2013 at 7:52

Bart Friederichs · Accepted Answer · 2013-09-05 07:52:58Z

3

you can use array_walk:

function fcn(&$item) {
   $item = substr(..do what you want here ...);
}

array_walk($matches, "fcn");

answered Sep 5, 2013 at 7:52

Bart Friederichs

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5 Comments

Bongsky Over a year ago

can i put my $matches array in the substr? I need to substr each result of the array @matches

Bart Friederichs Over a year ago

@Bongsky, no you cannot put $matches in substr. You have to walk over the array and apply substr to each individual element. To example I gave you will update the $matches array.

Bongsky Over a year ago

it does nothing... as ive known substr has 1st parameter string... what would be my parameters?

Bart Friederichs Over a year ago

@Bongsky in the fcn function in my example, $item holds the value of each item, so your call would be something like $item = substr($item, 5); or so.

Bongsky Over a year ago

i get this error sir... substr() expects parameter 1 to be string, array given

Sunil Kumar · Accepted Answer · 2013-09-05 08:02:28Z

3

Proper use of array_walk

array_walk( $matches, substr(your area));

Array_map accepts several arrays

array_map(substr(your area),  $matches1, $origarray2);

in your case

 array_map(substr(your area),  $matches);

1 Comment

Bongsky Over a year ago

what does your area implies? what are the parameters?

Salam · Accepted Answer · 2019-02-17 10:27:59Z

0

To find a sub string in an array I use this function on a production site, works perfectly.

I convert the array to a collection because it's easier to manage.

public function substrInArray($substr, Array $array) {
    $substr = strtolower($substr);
    $array = collect($array); // convert array to collection

    return $body_types->map(function ($array_item) {
        return strtolower($array_item);
    })->filter(function ($array_item) use ($substr) {
        return substr_count($array_item, $substr);
    })->keys()->first();

}

This will return the key from the first match, it's just an example you can tinker. Returns null if nothing found.

answered Feb 17, 2019 at 10:27

Salam

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