Programming Articles - Page 2031 of 3363

The ‘fgets’ function reads a line and stops when it encounters a newline −The above code opens a text file named ‘test’ in the read mode and reads the contents of the file until a newline character is encountered beginning from the starting byte. The file is then closed.The ‘fread’ function reads raw data and stops after a specific number of bytes or default bytes. This doesn’t depend on whether a newline was encountered or not −The above code opens a text file named ‘test’ in the read mode and reads 10 bytes after the starting byte. The file is ... Read More

To read a single fine inside z zip archive, the code is as follows −$handle = fopen('zip://test.zip#test.txt', 'r'); $result = ''; while (!feof($handle)) {    $result .= fread($handle, 8192); } fclose($handle); echo $result;The output will be the contents of the zip file.

pdependThe function pdepend is used to generate a large set of software metrics from a given code base. The generated values can be used to measure the quality of a software project. They help in identifying the parts of an application where refactoring is required.phpmdThe phpmd scans the PHP source code and searches for potential problems that could be possible bugs, not-so-optimal code, or overcomplicated expressions.phpcsThe phpcs function tokenises the PHP, JavaScript and CSS files and figures out issues/violations in a set of pre-defined coding standards. It ensures that the code remains consistent and neat. It also helps in preventing ... Read More

The same syntax used by is_callable and call_user_func can be used to pass static methods as arguments in PHP.To pass the static method, the below example can be used −Example Live Demo OutputThis will produce the following output −bool(true) my_func bool(true)

The syntax ‘$string{0} ‘ has been deprecated beginning from PHP version 6. Hence, it is strongly suggested to use $string[0].In short, accessing characters using the flower braces {} has been deprecated. Hence the square brackets should be used [] −Example Live Demo$string = 'medium'; echo $string{0}; echo $string[0];OutputThis will produce the following output −mm

An automatic module is a jar that we put on the modulepath. There is a number of pre-existing libraries that can be used in our applications, and many of these are not yet modularized. To facilitate migration, we can add any library’s jar file to an application’s module path, then use packages in that jar file. It can implicitly become an automatic module and can be specified in the module declaration’s requires directive. The jar’s filename becomes its module name that must be a valid Java identifier that can be used in "requires" directive.An automatic module:Implicitly exports all package types, so ... Read More

The Reflection API can be used to pass arguments from array to constructor.ReflectionClass::newInstanceArgsThe above line creates a new class instance from given arguments −public ReflectionClass::newInstanceArgs ([ array $args ] ) : objectIt creates a new instance of the class when the arguments are passed to the constructor. Here, args refers to the arguments that need to be passed to the class constructor.Example Live DemoOutputThis will produce the following output −object(ReflectionFunction)#2 (1) { ["name"]=> string(6) "substr" }

Due to the fact that Blowfish has vulnerabilities before PHP version 5.3.7, it would be suggested to use SHA-256 or SHA-512 instead. Both of them have a similar salt format similar to that of Blowfish (use a prefix of $5$ for SHA-256 and $6$ for SHA-512). In addition to this, it also contains an optional rounds parameter to force multiple hashing.The salt on its own is a little shorter at only 16 characters but unlike Blowfish, it allows more than just alphanumeric characters.Example Live Demoecho 'SHA-256 (no rounds): ' . crypt('password-to-encrypt', '$5$YourSaltyStringz$'); echo 'SHA-512 (with rounds): ' . crypt('password-to-encrypt', '$6$rounds=1000$YourSaltyStringz$');OutputThis will ... Read More

The ‘memory_limit’ is the maximum amount of server memory that a single PHP script is allowed to use. The value needs to be converted before comparing the threshold of memory.For example − 64M is converted to 64 * 1024 * 1024. After this, the comparison is done and the result is printed out.

Isset functionISSET checks the variable to see if it has been set. In other words, it checks to see if the variable is any value except NULL or not assigned a value. ISSET returns TRUE if the variable exists and has a value other than NULL. That means variables assigned a "", 0, "0", or FALSE are set, and therefore are TRUE for ISSET.Example Live DemoOutputThis will produce the following output −0 is set with isset function array is not set.!empty functionEMPTY checks to see if a variable is empty. Empty is interpreted as: "" (an empty string), 0 (integer), 0.0 ... Read More