I want to filter a string and to make an array using php

Question

This is my sample string (this one has five words; in practice, there may be more):

$str = "I want to filter it";

Output that I want:

$output[1] = array("I","want","to","filter","it");
$output[2] = array("I want","want to","to filter","filter it");
$output[3] = array("I want to","want to filter","to filter it");
$output[4] = array("I want to filter","want to filter it");
$output[5] = array("I want to filter it");

What I am trying:

$text = trim($str);
$text_exp = explode(' ',$str);
$len = count($text_exp);
$output[$len][] = $text;  // last element
$output[1] = $text_exp;  // first element

This gives me the first and the last arrays. How can I get all the middle arrays?

ejuhjav · Accepted Answer · 2015-07-21 09:08:01Z

2

more generic solution that works with any length word:

$output = array();

$terms = explode(' ',$str);
for ($i = 1; $i <= count($terms); $i++ )
{
    $round_output = array();
    for ($j = 0; $j <= count($terms) - $i; $j++)
    {
        $round_output[] = implode(" ", array_slice($terms, $j, $i));
    }
    $output[] = $round_output;
}

answered Jul 21, 2015 at 9:08

ejuhjav

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jedrzej.kurylo · Accepted Answer · 2015-07-21 09:36:10Z

1

You can do that easily with regular expressions that give you the most flexibility. See below for the way that supports dynamic string length and multiple white characters between words and also does only one loop which should make it more efficient for long strings..

<?php
$str = "I want to filter it";
$count = count(preg_split("/\s+/", $str));
$results = [];

for($i = 1; $i <= $count; ++$i) {
    $expr = '/(?=((^|\s+)(' . implode('\s+', array_fill(0, $i, '[^\s]+')) . ')($|\s+)))/';
    preg_match_all($expr, $str, $matches);
    $results[$i] = $matches[3];
}

print_r($results);

answered Jul 21, 2015 at 9:36

jedrzej.kurylo

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sujivasagam · Accepted Answer · 2015-07-21 08:55:12Z

0

You can use a single for loop and if conditions to do

$str = "I want to filter it"; 

$text = trim($str);
$text_exp = explode(' ',$str);
$len = count($text_exp);

$output1=$text_exp;
$output2=array();
$output3=array();
$output4=array();
$output5=array();
for($i=0;$i<count($text_exp);$i++)
{
    if($i+1<count($text_exp) && $text_exp[$i+1]!='')
    {
        $output2[]=$text_exp[$i].' '.$text_exp[$i+1];
    }

    if($i+2<count($text_exp) && $text_exp[$i+2]!='')
    {
        $output3[]=$text_exp[$i].' '.$text_exp[$i+1].' '.$text_exp[$i+2];
    }
    if($i+3<count($text_exp) && $text_exp[$i+3]!='')
    {
        $output4[]=$text_exp[$i].' '.$text_exp[$i+1].' '.$text_exp[$i+2].' '.$text_exp[$i+3];
    }
    if($i+4<count($text_exp) && $text_exp[$i+4]!='')
    {
        $output5[]=$text_exp[$i].' '.$text_exp[$i+1].' '.$text_exp[$i+2].' '.$text_exp[$i+3].' '.$text_exp[$i+4];
    }

}

answered Jul 21, 2015 at 8:55

sujivasagam

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3 Comments

Viral Over a year ago

Note that it will work for five words string only. @Adam

sujivasagam Over a year ago

Ok. you use the same with the output1, output2, etc.. as array

Viral Over a year ago

I suggest you to wait for better answers @AdamSmith

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