電子郵件成組的分割字符串，如果字符串的長度超過50個電子郵件

Question

不再有分裂包含電子郵件地址列表入組串說50說，我有一個包含以逗號分隔格式的郵件串的有效途徑。喜歡的東西... EMAIL1 @ host.com，EMAIL2 @ host.com，EMAIL3 @ host.com等。

最明顯的方法，這樣做很可能是一個數組，但有沒有辦法用字符串函數做呢？我看過substr和str_split，他們似乎沒有退出這個工作。

感謝

Answer 1

應該是迄今爲止更有效的搜索逗號50發生並在此之後拆分字符串。 所以找到這個位置。我想，這http://www.php.net/manual/en/function.strpos.php#102336應該是一個解決方案。 然後分裂與SUBSTR字符串，並在新的字符串的位置1刪除逗號。

縮短PHP代碼傳送到適合您的需要：

<?php 

function strnpos($haystack, $needle, $nth, $offset = 0) { 
    // If needle is not a string, it is converted to an integer and applied as the ordinal value of a character. 
    if(!is_string($needle)) 
     $needle = chr((int)$needle); 

    // Are the supplied values valid/reasonable? 
    $len = strlen($needle); 
    if(1 > $nth || 0 === $len) 
     return false; 

    // $offset is incremented in the call to strpos, so make sure that the first 
    // call starts at the right position by initially decreasing $offset by $len. 
    $offset -= $len; 
    do { 
     $offset = strpos($haystack, $needle, $offset + $len); 
    } while(--$nth && false !== $offset); 

    return $offset; 
} 

$emails_str = 'email1@host.com,email2@host.com,email3@host.com,...'; 

$pos = strnpos($emails_str, ',', 50, 0); 
while($pos) { 
    // Do sth. with the group... 
    echo substr($emails_str, 0, $pos), PHP_EOL; 

    // Cut this part out of the string 
    $emails_str = substr($emails_str, $pos+1); 
    $pos = strnpos($emails_str, ',', 50, 0); 
} 

Answer 2

呀，找

$string="word_1, word_2, word_3"; 
$array=preg_split("/([,]{49}[,])+",$string); 

或者你可以使用

的STRN * POS功能的一套完整查找乾草堆中針的第n次出現。我喜歡這個實現strnpos的，因爲當長度爲0的針（這是公認的，不規範的行爲）提供它不給可見的警告。基於版本I [最初發佈於2010年3月5日];這個新版本更符合strpos的語義。

<?php 

/** 
* This function implements all the strn*pos functions, which return the $nth occurrence of $needle 
* in $haystack, or false if it doesn't exist/when illegal parameters have been supplied. 
* 
* @param string $haystack  the string to search in. 
* @param MIXED $needle   the string or the ASCII value of the character to search for. 
* @param integer $nth   the number of the occurrence to look for. 
* @param integer $offset   the position in $haystack to start looking for $needle. 
* @param bool $insensitive should the function be case insensitive? 
* @param bool $reverse  should the function work its way backwards in the haystack? 
* @return MIXED integer   either the position of the $nth occurrence of $needle in $haystack, 
*    or boolean   false if it can't be found. 
*/ 
function strnripos_generic($haystack, $needle, $nth, $offset, $insensitive, $reverse) 
{ 
    // If needle is not a string, it is converted to an integer and applied as the ordinal value of a character. 
    if(! is_string($needle)) { 
     $needle = chr((int) $needle); 
    } 

    // Are the supplied values valid/reasonable? 
    $len = strlen($needle); 
    if(1 > $nth || 0 === $len) { 
     return false; 
    } 

    if($insensitive) { 
     $haystack = strtolower($haystack); 
     $needle = strtolower($needle ); 
    } 

    if($reverse) { 
     $haystack = strrev($haystack); 
     $needle = strrev($needle ); 
    } 

    // $offset is incremented in the call to strpos, so make sure that the first 
    // call starts at the right position by initially decreasing $offset by $len. 
    $offset -= $len; 
    do 
    { 
     $offset = strpos($haystack, $needle, $offset + $len); 
    } while(--$nth && false !== $offset); 

    return false === $offset || ! $reverse ? $offset : strlen($haystack) - $offset; 
} 

/** 
* @see strnripos_generic 
*/ 
function strnpos($haystack, $needle, $nth, $offset = 0) 
{ 
    return strnripos_generic($haystack, $needle, $nth, $offset, false, false); 
} 

/** 
* @see strnripos_generic 
*/ 
function strnipos($haystack, $needle, $nth, $offset = 0) 
{ 
    return strnripos_generic($haystack, $needle, $nth, $offset, true, false); 
} 

/** 
* @see strnripos_generic 
*/ 
function strnrpos($haystack, $needle, $nth, $offset = 0) 
{ 
    return strnripos_generic($haystack, $needle, $nth, $offset, false, true); 
} 

/** 
* @see strnripos_generic 
*/ 
function strnripos($haystack, $needle, $nth, $offset = 0) 
{ 
    return strnripos_generic($haystack, $needle, $nth, $offset, true, true); 
} 

$haystack = 'Dit is een HoTtentotTentenTentenToonstellingTest!'; 

echo strnpos ($haystack, 't', 5), ' === ', strnpos ($haystack, 116, 5), PHP_EOL; 
echo strnipos ($haystack, 't', 5), ' === ', strnipos ($haystack, 116, 5), PHP_EOL; 
echo strnrpos ($haystack, 't', 5), ' === ', strnrpos ($haystack, 116, 5), PHP_EOL; 
echo strnripos($haystack, 't', 5), ' === ', strnripos($haystack, 116, 5), PHP_EOL; 
echo PHP_EOL; 
echo strnpos ($haystack, 'T', 5), ' === ', strnpos ($haystack, 84, 5), PHP_EOL; 
echo strnipos ($haystack, 'T', 5), ' === ', strnipos ($haystack, 84, 5), PHP_EOL; 
echo strnrpos ($haystack, 'T', 5), ' === ', strnrpos ($haystack, 84, 5), PHP_EOL; 
echo strnripos($haystack, 'T', 5), ' === ', strnripos($haystack, 84, 5), PHP_EOL; 
?> 

Answer 3

$emails = 'email1@host.com,email2@host.com,email3@host.com,...'; 
if(substr_count($emails, '@') > 50) 
{ 
    $groups = explode(',', $emails); 
    $groups = array_chunk($groups, 50); 

    $emails = ''; 
    foreach($groups as $k => $group) 
    { 
     $group_data = implode(', ', $group); 
     $emails .= "{$group_data}<hr/>"; 
    } 
} 
echo $emails;