PHP general detection function set (5)_PHP tutorial
// Function name: AlertExit($C_alert,$I_goback=0)
// Function: Illegal operation warning
// Parameter: $C_alert (error message prompted)
// $I_goback (return to That page)
// Return value: String
// Remarks: None
//----------------------- -------------------------------------------------- ----------
-------
function AlertExit($C_alert,$I_goback=0)
{
if($I_goback0)
{
echo "<script>alert($C_alert);history.go($I_goback);</script>";
exit;
}
else
{
echo "<script>alert($C_alert);</script>";
exit;
}
}
//--------- -------------------------------------------------- --------------------------
------
//----- -------------------------------------------------- ----------------------------
-------
// Function name: ReplaceSpacialChar($C_char )
// Function: Special character replacement function
// Parameter: $C_char (string to be replaced)
// Return value: String
// Remarks: None
/ /------------------------------------------------- ----------------------------------
-------
function ReplaceSpecialChar( $C_char)
{
$C_char=HTMLSpecialChars($C_char); //Convert special characters into HTML format.
$C_char=nl2br($C_char); //Replace carriage return with
$C_char=str_replace(" "," ",$C_char); //Replace spaces with
$C_char=str_replace(" ","return $C_char;
}
//-------- -------------------------------------------------- --------------------------
-------
//---- -------------------------------------------------- --------------------------
-------
// Function name: ExchangeMoney($ N_money)
// Function: Fund conversion function
// Parameter: $N_money (amount to be converted)
// Return value: String
// Note: Example of this function: $ char=ExchangeMoney(5645132.3155) ==>
$char=¥5,645,132.31
//-------------------------- -------------------------------------------------- ------
-------
function ExchangeMoney($N_money)
{
$A_tmp=explode(".",$N_money ); //Press the number The decimal point is divided into two parts and stored in the array $A_tmp
$I_len=strlen($A_tmp[0]); //Measure the width of the digits in front of the decimal point
if($I_len%3== 0)
{
$I_step=$I_len/3; //If the width of the previous digits mod 3 = 0, it can be divided into $I_step
part
}else
{
$step=($len-$len%3)/3+1; //If the width of the previous digits mod 3 != 0, it can be divided into $I_step
part+1
}
$C_cur="";
//Convert the amount before the decimal point
while($I_len0)
{
$I_step--;
if($I_step==0)
{
$C_cur .= substr($A_tmp[0],0,$I_len-($I_step)*3);
}else
{
$C_cur .= substr($A_tmp[0],0,$I_len-($I_step)*3).",";
}
$A_tmp[0] =substr($A_tmp[0],$I_len-($I_step)*3);
$I_len=strlen($A_tmp[0]);
}
//After the decimal point Convert the amount
if($A_tmp[1]=="")
{
$C_cur .= ".00";
}else
{
$I_len =strlen($A_tmp[1]);
if($I_len{
$C_cur .= ".".$A_tmp[1]."0";
}else
{
$C_cur .= ".".substr($A_tmp[1],0,2);
}
}
//Add RMB symbol and transmit out
$C_cur="¥".$C_cur;
return $C_cur;
}
//----------------------------- -------------------------------------------------- -------------
------
//---------------- -------------------------------------------------- ------------------
------
// Function name: WindowLocation($C_url,$C_get="",$C_getOther="" )
// Function: window.location function in PHP
// Parameters: $C_url URL of the steering window
// $C_get GET method parameters
// $C_getOther Other parameters of the GET method
// Return value: String
// Remarks: None
//-------------------------- -------------------------------------------------- ------
-----
function WindowLocation($C_url,$C_get="",$C_getOther="")
{
if($C_get == "" && $C_getOther == "")
if($C_get == "" && $C_getOther ""){$C_target=""window.location=$C_url?
$C_getOther=+this .value"";}
if($C_get "" && $C_getOther == ""){$C_target=""window.location=$C_url?
$C_get"";}
if($C_get "" && $C_getOther ""){$C_target=""window.location=$C_url?
$C_get&$C_getOther=+this.value""; }
return $C_target;
}
//--------------------------------- --------------------------------------------------
-----
?>

TomakePHPapplicationsfaster,followthesesteps:1)UseOpcodeCachinglikeOPcachetostoreprecompiledscriptbytecode.2)MinimizeDatabaseQueriesbyusingquerycachingandefficientindexing.3)LeveragePHP7 Featuresforbettercodeefficiency.4)ImplementCachingStrategiessuc

ToimprovePHPapplicationspeed,followthesesteps:1)EnableopcodecachingwithAPCutoreducescriptexecutiontime.2)ImplementdatabasequerycachingusingPDOtominimizedatabasehits.3)UseHTTP/2tomultiplexrequestsandreduceconnectionoverhead.4)Limitsessionusagebyclosin

Dependency injection (DI) significantly improves the testability of PHP code by explicitly transitive dependencies. 1) DI decoupling classes and specific implementations make testing and maintenance more flexible. 2) Among the three types, the constructor injects explicit expression dependencies to keep the state consistent. 3) Use DI containers to manage complex dependencies to improve code quality and development efficiency.

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

PHPisusedforsendingemailsduetoitsbuilt-inmail()functionandsupportivelibrarieslikePHPMailerandSwiftMailer.1)Usethemail()functionforbasicemails,butithaslimitations.2)EmployPHPMailerforadvancedfeatureslikeHTMLemailsandattachments.3)Improvedeliverability

PHP performance bottlenecks can be solved through the following steps: 1) Use Xdebug or Blackfire for performance analysis to find out the problem; 2) Optimize database queries and use caches, such as APCu; 3) Use efficient functions such as array_filter to optimize array operations; 4) Configure OPcache for bytecode cache; 5) Optimize the front-end, such as reducing HTTP requests and optimizing pictures; 6) Continuously monitor and optimize performance. Through these methods, the performance of PHP applications can be significantly improved.

DependencyInjection(DI)inPHPisadesignpatternthatmanagesandreducesclassdependencies,enhancingcodemodularity,testability,andmaintainability.Itallowspassingdependencieslikedatabaseconnectionstoclassesasparameters,facilitatingeasiertestingandscalability.

CachingimprovesPHPperformancebystoringresultsofcomputationsorqueriesforquickretrieval,reducingserverloadandenhancingresponsetimes.Effectivestrategiesinclude:1)Opcodecaching,whichstorescompiledPHPscriptsinmemorytoskipcompilation;2)DatacachingusingMemc


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