PHP是一種通用的開源腳本語言。PHP的獨特語法是C，Java，Perl和PHP自己的語法的混合。它可以比CGI或Perl更快地執行動態網頁。與其他編程語言相比，用PHP創建的動態頁面是通過將程序嵌入HTML文檔中來執行的，其執行效率比完全生成HTML標簽的CGI更高。它可以嵌入HTML中，特別適合于Web開發。那么php socket如何設置超時？php字符串太長怎么辦？中培專家為您詳解。

　　php socket如何設置超時？

//如果$waitAckSec=0，則返回成功發送的字節

//如果$waitAckSec大于0，則返回發送后接收到得內容

//任何情況下，失敗都返回FALSE

function sendUdp($host, $port, $buff,$waitAckSec=0) {

$socket = ($result = @socket_create(AF_INET,SOCK_DGRAM,SOL_UDP));

//發送超時1秒

socket_set_option($socket,SOL_SOCKET,SO_RCVTIMEO,array("sec"=>3, "usec"=>0 ) );

//接收超時6秒

socket_set_option($socket,SOL_SOCKET,SO_SNDTIMEO,array("sec"=>6, "usec"=>0 ) );

if($socket){

$result = @socket_sendto($socket,$buff,strlen($buff),0,$host,$port);

if($waitAckSec>0){

$result = FALSE;

$read = array($socket);

$write = NULL;

$except = NULL;

if(@socket_select($read,$write,$except,$waitAckSec)>0){

$fromHost = "";

$fromPort = 0;

@socket_recvfrom($socket,$result,4096,0,$fromHost,$fromPort);

$result = phpext_unpack($result);

if($result["needAck"] == 1){

$this->sendUdp($host, $port, $result["ackdata"]);

if(isset ($result['data']['list']) && isset ($result['data']['totalCount'])){

$list = $result['data']['list'];

$count = $result['data']['totalCount'];

while($count> count($list)){

@socket_recvfrom($socket,$result_temp,4096,0,$fromHost,$fromPort);

$result_temp = phpext_unpack($result_temp);

$this->sendUdp($host, $port, $result_temp["ackdata"]);

$list = array_merge($list,$result_temp['data']['list']);

}

$result['data']['list'] = $list;

}

}else{

@socket_recvfrom($socket,$result,4096,0,$fromHost,$fromPort);

$result = phpext_unpack($result);

if($result["needAck"] == 1){

$this->sendUdp($host, $port, $result["ackdata"]);

if(isset ($result['data']['result']) && isset ($result['data']['userID'])){

$list = $result['data']['list'];

$count = $result['data']['totalCount'];

while($count> count($list)){

@socket_recvfrom($socket,$result_temp,4096,0,$fromHost,$fromPort);

$result_temp = phpext_unpack($result_temp);

$this->sendUdp($host, $port, $result_temp["ackdata"]);

$list = array_merge($list,$result_temp['data']['list']);

}

$result['data']['list'] = $list;

}

}

}

}else{

$result = SEND_UDP_ERROR;

}

}

@socket_close($socket);

}

return $result;

}

　　php字符串太長怎么辦？

php字符串太長的解決辦法：首先截取長度等于0或大于等于本字符串的長度，則返回字符串本身；然后如果截取長度為負數，那么截取長度就等于字符串長度減去截取長度；最后如果截取長度的絕對值大于字符串本身長度，則截取長度取字符串本身的長度。

if (! function_exists('mbSubStr')){

function mbSubStr($str, $length = 0, $append = true)

{

$str = trim($str);

$strlength = strlen($str);

if ($length == 0 || $length >= $strlength) {

return $str; //截取長度等于0或大于等于本字符串的長度，返回字符串本身

}elseif ($length < 0){ //如果截取長度為負數

$length = $strlength + $length;//那么截取長度就等于字符串長度減去截取長度

if ($length < 0) {

$length = $strlength;//如果截取長度的絕對值大于字符串本身長度，則截取長度取字符串本身的長度

}

}

if (function_exists('mb_substr')){

$newstr = mb_substr($str, 0, $length, 'utf-8');

}elseif (function_exists('iconv_substr')){

$newstr = iconv_substr($str, 0, $length, 'utf-8');

}else{

//$newstr = trim_right(substr($str, 0, $length));

$newstr = substr($str, 0, $length);

}

if ($append && $str != $newstr){

$newstr .= '...';

}

return $newstr;

}

}

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