How to get first 3 longest words from a sentence PHP

The solution would be like this:

Use explode() to get the words of the string in an array
"Partially" sort the array elements in descending order of length
Use a simple for loop to print the longest three words from the array.

So your code should be like this:

Method - 1

See the Example.

index.php

Example: PHP

<?php
$text = 'one four eleven no upstairs';
$arr = explode(" ", $text);
$count = count($arr);
for($i=0; $i < $count; $i++){
    $max = $arr[$i];
    $index = $i;
    for($j = $i + 1; $j < $count; ++$j){
        if(strlen($arr[$j]) > strlen($max)){
            $max = $arr[$j];
            $index = $j;
        }
    }
    $tmp = $arr[$index];
    $arr[$index] = $arr[$i];
    $arr[$i] = $tmp;
    if($i == 3) break;
}

// print the longest three words
for($i=0; $i < 3; $i++){
    echo $arr[$i] . '<br />';
}
?>

Output should be:

Method - 2

Alternative method: (Using predefined functions)

index.php

Example: PHP

<?php
$text = 'one four eleven no upstairs';
$arr = explode(" ", $text);
usort($arr,function($a, $b){
    return strlen($b)-strlen($a);
});
$longest_string_array = array_slice($arr, 0, 3);

// display $longest_string_array 
var_dump($longest_string_array);
?>

Output should be:

Method - 3

See my Example.

index.php

Example: PHP

<?php
$text = 'one four eleven no upstairs';
$arr = explode(" ", $text);
$count = count($arr);
for($i=0; $i < $count; $i++){
    $max = $arr[$i];
    $index = $i;
    for($j = $i + 1; $j < $count; ++$j){
        if(strlen($arr[$j]) > strlen($max)){
            $max = $arr[$j];
            $index = $j;
        }
    }
    $tmp = $arr[$index];
    $arr[$index] = $arr[$i];
    $arr[$i] = $tmp;
    if($i == 3) break;
}

// print the longest three words
for($i=0; $i < 3; $i++){
    $long .= $arr[$i] . ' ';
}

echo $long;
?>

Output should be:

Method - 4

You need to create your own comparative function and pass it with array to usort php function. Ex.:

<?php
function lengthBaseSort($first, $second) {
    return strlen($first) > strlen($second) ? -1 : 1;
}

$text = 'one four eleven no upstairs';
$arr = explode(" ", $text);
usort($arr, 'lengthBaseSort');

var_dump(array_slice($arr, 0, 3));

It will output 3 longest words from your statement.

According to author changes:

If you have no ability to use usort for some reasons (may be for school more useful a recursive function) use following code:

<?php
$text = 'one four eleven no upstairs';
$arr = explode(" ", $text);

function findLongest($inputArray) {
    $currentIndex = 0;
    $currentMax = $inputArray[$currentIndex];
    foreach ($inputArray as $key => $value) {
        if(strlen($value) > strlen($currentMax)){
            $currentMax = $value;
            $currentIndex = $key;
         }
     }
     return [$currentIndex, $currentMax];
}

for($i = 0; $i < 3; $i++) {
    $result = findLongest($arr);
    unset($arr[$result[0]]);
    var_dump($result[1]);
}
?>

Output should be:

php extract

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Read Full:	PHP String Tutorial
Type:	Develop
Category:	Web Tutorial
Sub Category:	PHP String Tutorial
Uploaded by:	Admin
Views:	109
Tested on:	PHP 7