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@ 2018-12-18T19:53:42Z

<?php

$dictionary = array("hello", "hi", "how r u", "how are you", "how r you", "how are u");


function isDictionaryWord($str,$dictionary){
    foreach($dictionary as $each_word){
        if(isSubsequence(strtolower($each_word),strtolower($str))){
            return true;
        }
    }
    return false;
}       

function isSubsequence($needle,$haystack){
    $len1 = strlen($needle);
    $len2 = strlen($haystack);
    if($len1 > $len2) return false;
    $ptr = 0;
    
    for($i=0;$i<$len2 && $ptr < $len1;$i++){
        if($haystack[$i] === $needle[$ptr]) $ptr++;
    }
    
    return $ptr == $len1;
}


$tests = array(
        'Hello',
        'Helloooo',
        'How r youuu !!!!',
        'hell',
        'w are y'
    );
    
foreach($tests as $each_test){
    echo $each_test," => ",var_dump(isDictionaryWord($each_test,$dictionary)),PHP_EOL;
}

Output for git.master, git.master_jit, rfc.property-hooks: Hello => bool(true) Helloooo => bool(true) How r youuu !!!! => bool(true) hell => bool(false) w are y => bool(false)

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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