Web студия "GrandView"

Описание

array explode ( string separator, string string [, int limit] )

Возвращает массив строк, полученных разбиением строки string с использованием separator в качестве разделителя. Если передан аргумент limit, массив будет содержать максимум limit элементов, при этом последний элемент будет содержать остаток строки string.

Если separator - пустая строка (""), explode() возвращает FALSE. Если separator не содержится в string, то explode() возвращает массив, содержащий один элемент string.

По историческим причинам, функции implode() можно передавать аргументы в любом порядке, но для explode() это недопустимо. separator всегда должен содержать разделитель, а string - исходную строку.

Замечание: Аргумент limit был добавлен в PHP 4.0.1

Пример 1. Примеры применения explode()

<?php // Пример 1 $pizza = "piece1 piece2 piece3 piece4 piece5 piece6"; $pieces = explode(" ", $pizza); echo $pieces[0]; // piece1 echo $pieces[1]; // piece2 // Пример 2 $data = "foo:*:1023:1000::/home/foo:/bin/sh"; list($user, $pass, $uid, $gid, $gecos, $home, $shell) = explode(":", $data); echo $user; // foo echo $pass; // * ?>

Замечание: Эта функция безопасна для обработки данных в двоичной форме.

См. также описание функций preg_split(), spliti(), split() и implode().

add a note User Contributed Notes
explode

kevin at vanzonneveld dot net
25-Oct-2007 08:44


We've written a function: explodeTree() that can explode any single-dimensional array into a full blown tree. The function uses a user-specified delimiter found in the keys of the original array to separate nodes and determine hierarchy.



Sample: with 3 lines of code you could have a full directory hierarchy in a multi-dimensional array if you specify the delimiter to be a '/' (slash).



I'm posting a link because the function is being improved by site visitors commenting on the article:

http://kevin.vanzonneveld.net/techblog/article/72/

pinkgothic at gmail dot com
15-Oct-2007 02:26


coroa at cosmo-genics dot com mentioned using preg_split() instead of explode() when you have multiple delimiters in your text and don't want your result array cluttered with empty elements. While that certainly works, it means you need to know your way around regular expressions... and, as it turns out, it is slower than its alternative. Specifically, you can cut execution time roughly in half if you use array_filter(explode(...)) instead.



Benchmarks (using 'too many spaces'):

Looped 100000 times:

preg_split: 1.61789011955 seconds

filter-explode: 0.916578054428 seconds



Looped 10000 times:

preg_split: 0.162719011307 seconds

filter-explode: 0.0918920040131 seconds



(The relation is, evidently, pretty linear.)



Note: Adding array_values() to the filter-explode combination, to avoid having those oft-feared 'holes' in your array, doesn't remove the benefit, either. (For scale - the '9' becomes a '11' in the benchmarks above.)



Also note: I haven't tested anything other than the example with spaces - since djogo_curl at yahoo's note seems to imply that explode() might get slow with longer delimiters, I expect this would be the case here, too.



I hope this helps someone. :)

mraheel83 at gmail dot com
24-Sep-2007 01:45


<?php 

                                            $query = "SELECT * FROM `orders_status` Where status = 'enabled'";  

                                            $result = mysql_query($query);  

                                            $counter = 0;

                                            $orderStatusRecords = explode(",",$_REQUEST['orderStatus']);

                                            

                                            while($row = mysql_fetch_array($result)) {

                                            echo $orderStatusRecords[$counter];

                                        ?>

                                            <input type="checkbox" name="chkOrderStatus[]" value="<?=$row['id']?>" <?php if($row['id'] == $orderStatusRecords[$counter]) {?> checked="checked" <?php } ?> /> <?=$row['title']?> &nbsp;

                                        <?php $counter++;

                                        } ?>

You can checked selected checkbox by using above explode + while loop combination

thomas at tgohome dot com
26-Jul-2007 02:47


This had me for a moment. A quick gotcha, for me, because it was causing some problems in a script of mine. 



If you explode an empty string, you'll get an array with one element - an empty string, and not an empty array or string as you may think. 



For example:



<?php

$string = "";

$numbers = explode(",", $string); // Array with one element, "". 



$string = "1,2,3";

$numbers = explode(",", $string); // Array with three elements

?>

tajhlande at gmail dot com
19-Jun-2007 05:28


While trying to use explode() to parse CSV formatted lines output by MS Excel, I found that if cells contained a comma, then explode() would not behave as desired.  So I wrote the following function, which obeys the double quote escaping format output by Excel.  Note that it is not sophisticated enough to handle delimiters or escapes that consist of more than one character.  I also have no idea how this code will perform when subjected to Unicode data.  Use at your own risk.



<?php



// splits a string into an array of tokens, delimited by delimiter char

// tokens in input string containing the delimiter character or the literal escape character are surrounded by a pair of escape characteres

// a literal escape character is produced by the escape character appearing twice in sequence

// default delimiter character and escape character are suitable for Excel-exported CSV formatted lines

function splitWithEscape ($str, $delimiterChar = ',', $escapeChar = '"') {

    $len = strlen($str);

    $tokens = array();

    $i = 0;

    $inEscapeSeq = false;

    $currToken = '';

    while ($i < $len) {

        $c = substr($str, $i, 1);

        if ($inEscapeSeq) {

            if ($c == $escapeChar) {

                // lookahead to see if next character is also an escape char

                if ($i == ($len - 1)) {

                    // c is last char, so must be end of escape sequence

                    $inEscapeSeq = false;

                } else if (substr($str, $i + 1, 1) == $escapeChar) {

                    // append literal escape char

                    $currToken .= $escapeChar;

                    $i++;

                } else {

                    // end of escape sequence

                    $inEscapeSeq = false;

                }

            } else {

                $currToken .= $c;

            }

        } else {

            if ($c == $delimiterChar) {

                // end of token, flush it

                array_push($tokens, $currToken);

                $currToken = '';

            } else if ($c == $escapeChar) {

                // begin escape sequence

                $inEscapeSeq = true;

            } else {

                $currToken .= $c;

            }

        }

        $i++;

    }

    // flush the last token 

    array_push($tokens, $currToken);

    return $tokens;

}



?>

IanB
25-May-2007 07:49


@ tobylewis



No, it should not return a null array! The description clearly states: If delimiter contains a value that is not contained in string, then explode() will return an array containing string. 



So it returns an array containing the original (empty) string.



Wouldn't you test for an invalid email address before trying to mail to it anyway? :S

tobylewis at logogriph dot com
25-May-2007 02:01


Watch out for this gottcha.  Consider:



$arr = explode("/", "");



This should return a null array (ie count($arr) == 0).  



Array

(

)



However, explode will instead return an array of one item which is a null string.



Array

(

    [0] => 

)



There is some logic to the way this works but consider  the following:



$addressees = "email@domain1.com, email@domain2.com";

$arr = explode(",", $addressees);

foreach($arr AS $to) mail ($to, $subject, $message);



with two items in the list it would sent two separate emails, with one it would sent one email message but with $addressees = "" it will still attempt to send one message that will fail because instead of returning an empty array explode returns an array with an empty item.

xangelusx at hotmail dot com
17-May-2007 08:45


@ JJ Rock, jason dot minett:



Here's an easy way around that:



<?php



$str = '^one^two^three^';



//Use trim() to remove extra delimiters

$arr = explode ('^', trim($str, '^'));



?>

JJ Rock
26-Apr-2007 04:02


Just a quick note to compliment jason dot minett's comment a few down:



It's obvious that this works the opposite way as well:



<?php



$str = "^one^two^three";



$arr = explode ("^", $str);



?>



results in an empty value in $arr[0].

user at nospam dot com
26-Apr-2007 02:08


<?php

// returns a string where $variables are replaced with their global value if available; removes all extra whitespaces



function evaluateString($string) {

  if ($string) {  // check for value

    $array = explode(' ', $string);  // split into parts

    foreach ($array as $word) {  // each part

      if ($word[0] == '$') {  // is part a variable

        if ($word = substr($word, 1)) {  // get variable name

          global ${$word};  // retrieve global value

          $html .= ${$word};  // add value to string

        }  // end variable name check

      } else {  // not a variable

        $html .= $word;  // add word to string

      }  // end variable check

      $html .= ' ';  // add space between words

    }  // end part loop

  }  // end string check

  return trim($html);  // trims final space from end

}  // end evaluateString



?>

Q1712 at online dot ms
22-Apr-2007 06:43


of cause i ment the limit with my previouse post



@admin: wold u please change every "delimiter" in that post to "limit" and delete this note. thx.

Q1712 at online dot ms
22-Apr-2007 08:30


some more notes on the delimiter:

if the delimiter is 0, explode will return an array with one element containig the hole string (same as if the delimiter was 1).

if a negative delimiter is bigger or equal to the number of components, an empty array is returned.



<?php

print_r( explode( "|", "one|two|three|four", 0) );

print_r( explode( "|", "one|two|three|four", 1) );

?>

both print:

Array

(

    [0] => one|two|tree|four

)



<?php

print_r( explode( "|", "one|two|three|four", -4) );

print_r( explode( "|", "one|two|three|four", -5) );

?>

both print:

Array

(

)

jason dot minett at custoREMOVEmscripts dot co dot uk
01-Mar-2007 08:09


A quick gotcha that had me head scratching for a while....



If the delimiter occurs right at the end of the string there will be an extra array element (an empty string):



<?php



$str = "aaa^elephant^chocolate^albatross^";



$arr = explode ("^", $str);



echo ("Array length: ".count($arr));



?>



---------------------------------



Array length: 5

Nicoxinchao
27-Feb-2007 11:59


insensitive case explode function:



<?php



function iExplode($Delimiter, $String, $Limit = '')

    {

    $Explode = array();    

    $LastIni = 0;

    $Count   = 1;

    

    if (is_numeric($Limit) == false)

        $Limit = '';



    while ( false !== ( $Ini = stripos($String, $Delimiter, $LastIni) ) && ($Count < $Limit || $Limit == ''))

        {

        $Explode[] = substr($String, $LastIni, $Ini-$LastIni);

        $LastIni = $Ini+strlen($Delimiter);

        $Count++;

        }

        

    $Explode[] = substr($String, $LastIni);        

    return $Explode;    

    }



?>

orlandu96 at gmail dot com
16-Dec-2006 09:28


A 'between' function that we've all been waiting for. I am not savvy with regex so I resorted to explode();



<?php

function between($beg, $end, $str) {

$a = explode($beg, $str, 2);

$b = explode($end, $a[1]);

return $beg . $b[0] . $end;

}



echo between('<a>', '</a>', 'fsdfsdfsd<a>fsdfsd<a><a></a>sdfsdfsdf')

//<a>fsdfsd<a><a></a>

?>

seventoes at gmail dot com
09-Dec-2006 07:49


Note that explode, split, and functions like it, can accept more than a single character for the delimiter.



<?php

$string = "Something--next--something else--next--one more";



print_r(explode('--next--',$string));

?>

Elad Elrom
20-Oct-2006 11:50


// simple function to remove words if more than max allowed words or add a charcter once less than min

// Example: LimitText("The red dog ran out of thefence",15,20,"<br>");



function LimitText($Text,$Min,$Max,$MinAddChar) {

    if (strlen($Text) < $Min) {

        $Limit = $Min-strlen($Text);

        $Text .= $MinAddChar;

    }

    elseif (strlen($Text) >= $Max) {

        $words = explode(" ", $Text);

        $check=1;

        while (strlen($Text) >= $Max) {

            $c=count($words)-$check;            

            $Text=substr($Text,0,(strlen($words[$c])+1)*(-1));

            $check++;

        }

    }

    

    return $Text;

}

webmaster at saund-web dot com
13-Mar-2006 10:20


If you want to split a price (float) into pounds and pence.



or dollors and cents etc etc.        



$price = "6.20";



$split = explode(".", $price);

$pound = $split[0]; // piece1

$pence = $split[1]; // piece2



echo "&pound $pound . $pence\n";

djogo_curl at yahoo
01-Dec-2004 04:50


Being a beginner in php but not so in Perl, I was used to split() instead of explode(). But as split() works with regexps it turned out to be much slower than explode(), when working with single characters.

ian at illumen dot co dot uk
24-Aug-2004 01:30


If you split an empty string, you get back a one-element array with 0 as the key and an empty string for the value.



<?php



$str = '';



$foo = explode( ":", $str );

print_r( $foo );



$foo = split( ":", $str );

print_r( $foo );



$foo = preg_split( "/:/", $str );

print_r( $foo );



?>



In all three cases prints



Array

(