Accessing Substrings in a PHP array

Question

Assume I have a array like this:

$check="Ninja Turtles";
$key=array("jack and jil","peter likes pan","Ninja Turtles");

I want to find whether the keywords 'Ninja Turtels' in the $check variable exist in the ARRAY and if so I want to know in which INDEX of the ARRAY it exists in. My above code works perfectly fine, but what if my $check variables has some extra words like:

$check="Ninja blah bleh Turtles"

My code won't work then. I want to ignore the 'blah bleh' words in my string.

I managed to work around it with Python because I have years of experience in python but I am new to php.

My Code

foreach (array_values($key) as $i => $val) {
    $pos = strpos($check, $val);
    if ($pos === false) {
           echo "The string '$chechk' was not found in the ARRAY";
    } else {
            echo "Found '$check' at Postion: '$i'";


       }

  }

My Full Python Code

check="Ninja bleh balah Turtles"
key=["jack and jil","peter likes pan","Ninja Turtles"]
for index, name in enumerate(KEY):
     if(name in phrase):
         print("Found", name +" Index is ", index)
         active="Found", name +" Index is ", index
         break
     else:
         newkey=name.split()
         newphrase=check.split()
         num = 2
         l = [i for i in newkey if i in newphrase]
         if len(l) >= num:
             print('Found', name +" "+ "Index is", index)
             active="Found", name +" Index is ", index
             break

It looks like you used $chechk when you meant $check.

halfer
– halfer

2017-07-23 20:53:08 +00:00
Commented Jul 23, 2017 at 20:53 — halfer
– halfer, Commented Jul 23, 2017 at 20:53

mokamoto12 · Accepted Answer · 2017-07-23 17:12:45Z

1

Similar php code is:

$check = "Ninja bleh balah Turtles";
$key = ["jack and jil", "peter likes pan", "Ninja Turtles"];

foreach($key as $index => $name) {
    if ($name === $check) {
        echo "Found $name Index is $index";
        return;
    } else {
        $newKey = explode(' ', $name);
        $newPhase = explode(' ', $check);
        $num = 2;
        $l = array_filter($newKey, function ($nkey) use ($newPhase) {
            return in_array($nkey, $newPhase);
        });
        if (count($l) >= $num) {
            echo "Found $name Index is $index";
            return;
        }
    }
}

answered Jul 23, 2017 at 17:12

mokamoto12

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1 Comment

Elo97234c Over a year ago

Simple, and perfect!

Ray Paseur · Accepted Answer · 2017-07-23 16:47:27Z

1

Something like this should help you get started... https://iconoun.com/demo/temp_elo.php

<?php // demo/temp_elo.php
/**
 * Working with substrings
 *
 * https://stackoverflow.com/questions/45267396/accessing-substrings-in-a-php-array
 */
error_reporting(E_ALL);
echo '<pre>';


$target = "Ninja blah Turtles";
$source = [ "jack and jil", "peter likes pan", "Ninja Turtles" ];

// SEPARATE THE TARGET INTO ITS SUBSTRINGS
$targets = explode(' ', $target);

// TEST EACH OF THE SOURCE STRINGS
foreach ($source as $string)
{
    echo PHP_EOL . $string;
    foreach ($targets as $tgt)
    {
        if (stripos($string, $tgt) !== FALSE)
        {
            echo " CONTAINS $tgt";
        }
    }
}

answered Jul 23, 2017 at 16:47

Ray Paseur

2,2042 gold badges14 silver badges17 bronze badges

Comments

Andreas · Accepted Answer · 2017-07-23 17:18:34Z

Instead of matching check with array I do it the other way around with preg_match.

$check="Ninja blah bleh Turtles";
$key=array("jack and jil","peter likes pan","Ninja Turtles");

Foreach($key as $k => $val){
    $pattern = "/" . Implode("|", explode(" ",$val)) . "/";
    //Echo $pattern;
    If(preg_match($pattern, $check)) echo $k;
}

Output:

2 //as in $key[2] is where it matches.

https://3v4l.org/duYpU

Explode the "Ninja Turtles" to array and put them back together with | in-between (regex or).
Then add / to complete the regex pattern.
Check if this pattern matches $check.
If true echo key value.

Edit; while doing the dishes I realized $pattern can be done like this instead.

$pattern = "/" . Str_replace(" ", "|", $val) ."/";

It just replace space with regex or instead of exploding and imploding. Probably not much performance difference but it's more correct way to do it.

kip · Accepted Answer · 2017-07-23 17:55:42Z

Try with tis:

$check = "Ninja bleh bleh Turtles";
$key = array("jack and jil","peter likes pan","Ninja Turtles");

foreach ($key as $k => $keyValue) {
    foreach (explode(' ', $check) as $valueCheck) {
        if (strstr($keyValue, $valueCheck)) {
            printf('[%s => %s]', $k, $keyValue);
            break;
        }
    }
}

Result:

[2 => Ninja Turtles]

But you can use array_filter()

$check = "Ninja bleh bleh Turtles";
$key = array("jack and jil","peter likes pan","Ninja Turtles");

$found = array_filter($key, function($value) use($check) {
    return array_filter(explode(' ', $check), function($valueKey) use($value) {
        return strstr($value, $valueKey);
    });
});

print_r($found);

Result:

Array
(
    [2] => Ninja Turtles
)

Or use preg_grep() and reg expressions:

$check = "Ninja bleh bleh Turtles";
$key = array("jack and jil","peter likes pan","Ninja Turtles");

$pattern = '/' . str_replace(' ', '|', $check) . '/';
$foundbyRegex = preg_grep($pattern, $key);

print_r($foundbyRegex);

Result:

Array
(
    [2] => Ninja Turtles
)

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