要用到短信平臺的緣故，短信每條又有字數的限制，而短信平臺的服務端又不會自己分析。
短信平臺的後臺會自己分割，但api卻有沒這個功能。
在網上找了一點時間，發現都不怎樣。
後來就自己想了個辦法，算是原創吧。
只是用截取加替換的功能。
function smssubstr($string, $length) {
if(strlen($string) <= $length) {
return $string;
}
$strcut = '';
for($i = 0; $i < $length; $i++) {
$strcut .= ord($string[$i]) > 127 ? $string[$i].$string[++$i] : $string[$i];
}
return $strcut;
}
for($i=1; $i<=$smsnum; $i++){
${'smscontent'.$i} = smssubstr($message,$smsper);
$message = str_replace(${'smscontent'.$i},"",$message);
}
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