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Digital Signature: Hash The data and the private key to get a message digest, along with the message itself, to the Client. The data signature emphasizes that the data received by the client is from a specific server, and the server has

Morning:Database summary:1. Create a databaseCreate DATABASE nameDeleting a databaseDrop database name2. Create a tableCREATE TABLE Table name(Column name type (length) from the growth primary key is not empty,)Self-growth: auto_incrementPrimary Key:

Share 2 types of PHP source code encryption, this encryption method supports any PHP version. Note that the encrypted PHP code does not need to be decrypted by a third-party tool, as usual, to run directly. Copy CodeThe code is as

Randomly generate n-bit stringsFunctionrand_str ($num) {$str = "qwertyuioplkjhgfdsazxcvbnmQAZWSXEDCRFVTGBYHNUJMIKOLP1234567890";$str _len = strlen ($str)-1;echo $str _len;$s = ";for ($i = 0; $i $s. = $str [rand (0, $str _len)];}echo$s;}Rand_str (32);

Copy the Code code as follows: $rs = ' readme.md '; $fp = fopen ($rs, ' R '); Fseek ($fp, -1,seek_end); $s = ";while (($c = fgetc ($fp))!== false){if ($c = = "\ n" && $s) break;$s = $c. $s;Fseek ($FP,-2, seek_cur);}Fclose ($FP);Echo $s;Exit

A character in a string specified in PHP is replaced with an asterisk we have a function that can be implemented such as Substr,preg_replace,substr_replace and so on, I give these three functions respectively to introduce an example, mainly talk

Write an array to the configuration file. Why does the & symbol change to & amp; $ config_arr = var_export ($ configdata, true ); $ Config_txt =" File_put_contents ('config. ini. php', $ config_txt ); $ Config_arr is an array with the & symbol

1. {} indicates the start and end of the block For example Copy the Code code as follows:if ($x = = $y){Do_nothing ();} 2. {} is used to denote a string subscript For example(quoting the words of Longnetpro Brothers)The $s {1} represents the 2nd

echo "Connecting as MySQL \ n "; $connection 1 = mysql_connect (' localhost ', ' MySQL ', ') or Die ($php _errormsg); echo "Connection1 is $connection 1 \ n "; echo "Selecting test for MySQL user \ n "; mysql_select_db (' Test ', $connection 1) or

Some PHP interview questions preface life always has to go forward, wait for a day without Alibaba's interview notice, the mood is quite gloomy, but life always has to continue, still have to look forward, I have made several PHP interview questions.

Is PHP decimal calculation too boring? If (0.030 & nbsp ;! = & Nbsp; (0.530-0.500 + 0 + 0) {& nbsp; $ s & nbsp ;=& nbsp; 0.530-0.500 + 0 + 0; & nbsp; $ s & nbsp; = & nbsp; 0.03 & n is the calculation method of PHP decimal places too boring? If (0.030

PHP submits a request to automatically filter out the specified characters in the input box. how can this problem be solved? When submitting data, filter out the & lt; img & nbsp; src = & nbsp; and & nbsp; & gt; & nbsp; characters in all input data

Parseerror: syntaxerror, unexpectedT_STRINGinC: \ AppServ \ www \ 1. phponline3 & lt ;? Php & nbsp; $ s = array ('hello', 'hello', 'Hello everybody '); & nbsp; & nb Parse error: syntax error, unexpected T_STRING in C: \ AppServ \ www \ 1.php on line

How to transcode a string to urlencode directly using urlencode? the result is a string instead of the following: % 6E1% 7A % 62% 2F % 6D % 615% 5C % 76% how can an English character be converted into this format of how to transcode a string into

Voting Interface CodePHPinclude"Function/unionsql-function.php";if(isset($_post[' Submit ']) &&isset($_post[' ATR '])){ $atr=$_post[' ATR ']; foreach($atr as $i) { $s 3= "Select number from dy where code=$i[0] "; $s 3=unionsql ($s 3); $

PHP pack, unpack, Ord function using method (binary stream Interface application example) At work, I also learned that Pack,unpack,ord is powerful for binary byte processing. Let me introduce them to you. In our work, there is not much estimation of

A virtual machine 1. Mount the virtual machine in NAT Nic mode 2. It is best to use a few virtual machines to modify the hostname, static ip/etc/network/interface, here is S101 s102 s103 three host Ubantu, change/etc/hostname file

1. If a method can be static, declare it static. Speed improvement are by a factor of 4. If a method is static, it is statically declared. The rate can be increased to 4 times times. 2. Echo is faster than print. echo is faster than print. 3. Use

1, PHP recessive ternary operator (?:) Priority issues: Example 1:Copy the Code code as follows:$person = $who or $person = "laruence";is actually equivalent to:$person = Empty ($who)? "Laruence": $who;Example 2Copy the Code code as follows:$arr =

1. If a method can be static, declare it static. Speed improvement are by a factor of 4. If a method is static, it is statically declared. The rate can be increased to 4 times times. 2. Echo is faster than print. echo is faster than print. 3. Use