The PHP function preg_split splits a string by a regular expression. Example: <?php // split by comma $colors = "red, gr... Prints: array(3) { [0]=> string(3) "red" [1...

Integer.bitCount counts the number of one-bits in the two's complement binary representation of the specified int value. Example code: public class CountOnes { public static void... For long , there's Long.bitCount()

The PHP manual says that the count function also counts the properties for an object. Not true. Using count on an object reference always returns 1. In order to count properties, you have to cast the object to an array, which is equivalent to calling get_object_vars on the object. When you cast an object to an array, count is still counting the number of elements in an array! <?php class Vegetable { var $name; ... Outputs: array(3) { ["name"]=> string(7) "Cabbage...

The function substr accepts negative index number, which counts from the end of the string backwards. <?php // get the last character echo substr(...

This utility class retrieves SSL certificates from the server and print them out to the stdout. The output can be saved to a file and imported to a Java keystore. This is useful in your test environment where the SSL certificate is self-signed. import java.io.InputStream; import java.io.Outp... Retrieve and import the a certificate: E:\test>java RetrieveSSLCert 192.168.69.144 8081 >...

Method 1 - use javap with verbose flag: $ javap HelloWorld -verbose | head Compiled fro... Method 2 - use a utility class: import java.io.*; import java.nio.ByteBuffer; ... According to the VM Spec , a Java class file has this structure: ClassFile { u4 magic; ...

The Unix shell passes these parameters to the shell script: Variable Meaning $* A single string representing all command line arguments separated by $IFS (internal field separator, usually a space) $@ A sequence of strings representing the command line arguments. $1,$2...$n $1 is the first argument, $2 is the second argument, and so on... $0 The name of the script itself. $# The number of arguments. Example shell script ( sharg.sh ): #!/bin/sh echo $# arguments passed to $0: $@ ... Output for ./sharg.sh "a b c d" : 1 arguments passed to ./sharg.sh: a b c d here ... Output for ./sharg.sh a "b c" d : 3 arguments passed to ./sharg.sh: a b c d here ...

If Command Extensions are enabled (which is enabled by default), then there are several dynamic environment variables that can be expanded but which don't show up in the list of variables displayed by SET . These variable values are computed dynamically each time the value of the variable is expanded (but see example below). If the user explicitly defines a variable with one of these names, then that definition will override the dynamic one described below: %CD% - expands to the current directory string. %DATE% - expands to current date using same format as DATE command. %TIME% - expands to current time using same format as TIME command. %RANDOM% - expands to a random decimal number between 0 and 32767. %ERRORLEVEL% - expands to the...

%PATH:str1=str2% would expand the PATH environment variable, substituting each occurrence of " str1 " in the expanded result with " str2 ". " str2 " can be the empty string to effectively delete all occurrences of " str1 " from the expanded output. " str1 " can begin with an asterisk, in which case it will match everything from the beginning of the expanded output to the first occurrence of the remaining portion of str1. %PATH:~10,5% would expand the PATH environment variable, and then use only the 5 characters that begin at the 11th (offset 10) character of the expanded result. If the length is not specified, then it defaults to the remainder of the variable value. If either number (offset or length) is negative,...

The ECMAScript defines these single character escape sequences: Escape Sequence Code Unit Value Name Symbol \b \u0008 backspace <BS> \t \u0009 horizontal tab <HT> \n \u000A line feed (new line) <LF> \v \u000B vertical tab <VT> \f \u000C form feed <FF> \r \u000D carriage return <CR> \" \u0022 double quote " \' \u0027 single quote ' \\ \u005C backslash \ Escape sequences can also be: \0 (backspash zero): the <NUL> character. \xdd (x followed by two hexadecimal digits): a Latin-1 character whose code unit value is the value of the hexadecimal number. \udddd (u followed by 4 hexadecimal digits): A Unicode character whose code unit value equals the value of the hexadecimal number. \ddd (backslash followed by 3 octal digits): a Latin-1 character specified as...