PHP是一种通用的开源脚本语言。PHP的独特语法是C，Java，Perl和PHP自己的语法的混合。它可以比CGI或Perl更快地执行动态网页。与其他编程语言相比，用PHP创建的动态页面是通过将程序嵌入HTML文档中来执行的，其执行效率比完全生成HTML标签的CGI更高。它可以嵌入HTML中，特别适合于Web开发。那么php socket如何设置超时？php字符串太长怎么办？中培专家为您详解。

　　php socket如何设置超时？

//如果$waitAckSec=0，则返回成功发送的字节

//如果$waitAckSec大于0，则返回发送后接收到得内容

//任何情况下，失败都返回FALSE

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

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

//发送超时1秒

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

//接收超时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字符串太长怎么办？

php字符串太长的解决办法：首先截取长度等于0或大于等于本字符串的长度，则返回字符串本身；然后如果截取长度为负数，那么截取长度就等于字符串长度减去截取长度；最后如果截取长度的绝对值大于字符串本身长度，则截取长度取字符串本身的长度。

if (! function_exists('mbSubStr')){

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

{

$str = trim($str);

$strlength = strlen($str);

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

return $str; //截取长度等于0或大于等于本字符串的长度，返回字符串本身

}elseif ($length < 0){ //如果截取长度为负数

$length = $strlength + $length;//那么截取长度就等于字符串长度减去截取长度

if ($length < 0) {

$length = $strlength;//如果截取长度的绝对值大于字符串本身长度，则截取长度取字符串本身的长度

}

}

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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