The Thirteenth Day of PHP Practice_PHP Tutorial

Today I revisited object-oriented programming and learned about __construct, a magic method that instantiates object parameters, and __destruct, a magic method that is executed before an object is destroyed
Also
The first parameter of __get to obtain the private member attribute is the obtained name
The first parameter of __set to set the private member attribute is the member name and the second parameter is the passed value
If __call does not find the matching method, it will be called. The first parameter is the name of the call, and the second parameter is the passed parameter
__isset is used to determine whether the member exists. The first parameter is the member name
__unset will be called when used to destroy members
[php]
/*
* Function strmin For example: if you want to get the full text as "12345", now you need to get "3", the front of <3> is "2", the end of <3> is "4",
* Parameter $nString text type, , for example: if you want to get the full text, it is 12345
* Parameter $sString text type, , the front of 3 is "2",
* Parameter $eString text type, , followed by 3 is "4"
* Parameter $position is an integer type, can be empty, the starting search position of the text to be found
* Parameter $isStr, logical type, nullable, default is false, case sensitive
*/
function strmin($nString,$sString,$eString,$position=0,$isStr)
{
If ($isStr) {
                $s=strpos($nString, $sString,$position);


                $e=strpos($nString, $eString,$s);
         }else{
                $s=stripos($nString, $sString,$position);


                $e=strpos($nString, $eString,$s);
         } 
          $s=$s+strlen($sString);
$e=$e-$s;
         return substr($nString,$s,$e);


}


/*
* Function strleft Click the text you want to find from the left side of the text to start searching
* Parameter $nString text type, , the text being searched
* Parameter $string text type, , the text to be found
* Parameter $position is an integer type, can be null, the starting search position of the text to be found
* Parameter $isStr, logical type, nullable, default is false, case sensitive
* Parameter $goNum, integer type, can be null, number of skips, the default is 0, no skip
*/
Function strleft($nString,$string,$position=0,$isStr=false,$goNum=0)
{
         $p=$position;


do {
                                                                                $goNum--;
echo $p."
";


If ($isStr) {
                $p=strpos($nString, $string,$p);
         }else{
                $p=stripos($nString, $string,$p);
         } 
                                                                                  $p++;


          } while ($goNum>=0);


          $p--; 
         return substr($nString,0,$p);
}  

/*
* Function strmin For example: if you want to get the full text as "12345", now you need to get "3", the front of <3> is "2", the end of <3> is "4",
* Parameter $nString text type, , for example: if you want to get the full text, it is 12345
* Parameter $sString text type, , the front of 3 is "2",
* Parameter $eString text type, , followed by 3 is "4"
* Parameter $position is an integer type, can be null, the starting search position of the text to be found
* Parameter $isStr, logical type, nullable, default is false, case sensitive
*/
function strmin($nString,$sString,$eString,$position=0,$isStr)
{
if ($isStr) {
$s=strpos($nString, $sString,$position);

$e=strpos($nString, $eString,$s);
}else{
$s=stripos($nString, $sString,$position);

$e=strpos($nString, $eString,$s);
}
$s=$s+strlen($sString);
$e=$e-$s;
Return substr($nString,$s,$e);

}

/*
* Function strleft Click the text you want to find from the left side of the text to start searching
* Parameter $nString text type, , the text being searched
* Parameter $string text type, , the text to be found
* Parameter $position is an integer type, can be null, the starting search position of the text to be found
* Parameter $isStr, logical type, nullable, default is false, case sensitive
* Parameter $goNum, integer type, can be null, number of skips, the default is 0, no skip
*/
function strleft($nString,$string,$position=0,$isStr=false,$goNum=0)
{
$p=$position;

do {
 
$goNum--;
echo $p."
";

if ($isStr) {
$p=strpos($nString, $string,$p);
}else{
$p=stripos($nString, $string,$p);
}
                         
$p++;

} while ($goNum>=0);

$p--;
Return substr($nString,0,$p);
}

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