function BigEndian2Int($byte_word, $signed = false) {
$int_value = 0;
$byte_wordlen = strlen($byte_word);
for ($i = 0; $i {
$int_value += ord($byte_word{$i}) * pow(256, ($byte_wordlen - 1 - $i));
}
if ($signed)
{
$sign_mask_bit = 0x80 if ($int_value & $sign_mask_bit)
{
$int_value = 0 - ($int_value & ($sign_mask_bit - 1));
}
}
return $int_value;
}
function getTime($name){
if(!file_exists($name)){
return;
}
$flv_data_length=filesize($name);
$fp = @fopen($name, 'rb');
$flv_header = fread($fp, 5);
fseek($fp, 5, SEEK_SET);
$frame_size_data_length =BigEndian2Int(fread($fp, 4));
$flv_header_frame_length = 9;
if ($frame_size_data_length > $flv_header_frame_length) {
fseek($fp, $frame_size_data_length - $flv_header_frame_length, SEEK_CUR);
}
$duration = 0;
while ((ftell($fp) + 1) $this_tag_header = fread($fp, 16);
$data_length = BigEndian2Int(substr($this_tag_header, 5, 3));
$timestamp = BigEndian2Int(substr($this_tag_header, 8, 3));
$next_offset = ftell($fp) - 1 + $data_length;
if ($timestamp > $duration) {
$duration = $timestamp;
}
fseek($fp, $next_offset, SEEK_SET);
}
fclose($fp);
return $duration;
}
function fn($time){
$num = $time;
$sec = intval($num / 1000);
$h = intval($sec / 3600);
$m = intval(($sec % 3600) / 60);
$s = intval(($sec % 60 ));
$tm = $h . ':' . $m . ':' . $s ;
return $tm;
}
echo getTime("27729.flv");//显示数字时间如236722
echo fn(236722); //显示时间格式0:03:56
?>

tomakephpapplicationsfaster,關注台詞:1)useopcodeCachingLikeLikeLikeLikeLikePachetoStorePreciledScompiledScriptbyTecode.2)MinimimiedAtabaseSqueriSegrieSqueriSegeriSybysequeryCachingandeffeftExting.3)Leveragephp7 leveragephp7 leveragephp7 leveragephpphp7功能forbettercodeefficy.4)

到ImprovephPapplicationspeed,關注台詞:1)啟用opcodeCachingwithapCutoredUcescriptexecutiontime.2)實現databasequerycachingingusingpdotominiminimizedatabasehits.3)usehttp/2tomultiplexrequlexrequestsandreduceconnection.4 limitesclection.4.4

依赖注入(DI)通过显式传递依赖关系,显著提升了PHP代码的可测试性。1)DI解耦类与具体实现,使测试和维护更灵活。2)三种类型中,构造函数注入明确表达依赖,保持状态一致。3)使用DI容器管理复杂依赖,提升代码质量和开发效率。

DatabasequeryoptimizationinPHPinvolvesseveralstrategiestoenhanceperformance.1)Selectonlynecessarycolumnstoreducedatatransfer.2)Useindexingtospeedupdataretrieval.3)Implementquerycachingtostoreresultsoffrequentqueries.4)Utilizepreparedstatementsforeffi

phpisusedforsenderemailsduetoitsbuilt-inmail()函數andsupportivelibrariesLikePhpMailerAndSwiftMailer.1)usethemail()functionForbasiceMails,butithasimails.2)butithasimail.2)

PHP性能瓶颈可以通过以下步骤解决:1)使用Xdebug或Blackfire进行性能分析,找出问题所在;2)优化数据库查询并使用缓存,如APCu;3)使用array_filter等高效函数优化数组操作;4)配置OPcache进行字节码缓存;5)优化前端,如减少HTTP请求和优化图片;6)持续监控和优化性能。通过这些方法,可以显著提升PHP应用的性能。

依賴性注射(DI)InphpisadesignPatternthatManages和ReducesClassDeptions,增強量強制性,可驗證性和MATIALWINABIOS.ItallowSpasspassingDepentenciesLikEdenciesLikedAbaseConnectionStoclasseconnectionStoclasseSasasasasareTers,interitationAseTestingEaseTestingEaseTestingEaseTestingEasingAndScalability。

cachingimprovesphpermenceByStorcyResultSofComputationsorqucrouctationsorquctationsorquickretrieval,reducingServerLoadAndenHancingResponsetimes.feftectivestrategiesinclude:1)opcodecaching,whereStoresCompiledSinmememorytssinmemorytoskipcompliation; 2)datacaching datacachingsingMemccachingmcachingmcachings


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