This statement is true. By default, the str_replace() function in PHP is case-sensitive. It performs replacements in a case-sensitive manner, meaning that the search for the specified string is case-sensitive. If you want to perform case-insensitive replacements, you would need to use the str_ireplace() function instead. Learn more: https://www.php.net/manual/en/function.str-replace.php

In PHP, you can use the mysqli_query() function to execute a query against a MySQL database. This function takes two parameters: the connection object and the SQL query you want to execute. The SQL query can be any valid MySQL statement, such as SELECT, INSERT, UPDATE, or DELETE. The mysqli_query() function returns a result object for successful SELECT queries or a boolean value for other types of queries. It's important to use prepared statements or proper escaping techniques to prevent SQL injection vulnerabilities when executing user-supplied data as part of the query.

To get the properties of an image such as size, width, and height in PHP, you can use the following functions: - 'getimagesize()' returns an array containing the size, width, height, and other attributes of the image. - 'imagesx()' returns the width of the image. - 'imagesy()' returns the height of the image. These functions are part of the GD library and are commonly used for image processing and manipulation in PHP.

To find out the number of characters in a string in PHP, you can use the strlen() function. The strlen() function returns the length of a string in terms of the number of characters. Simply pass the string as an argument to strlen() like this: strlen($string). The function will return the length of the string, which corresponds to the number of characters. Learn more: https://www.php.net/manual/en/function.strlen.php

To check if a variable is an integer in PHP, you can use the is_int() function. The is_int() function checks if a variable is of type integer. It returns true if the variable is an integer and false otherwise. This function is useful when you specifically need to verify that a variable is of integer type. Learn more: https://www.php.net/manual/en/function.is-int.php

To move an uploaded file to a specific directory in PHP, you can utilize the move_uploaded_file() function. This function moves the file to the desired directory. Check out: http://php.net/manual/en/function.move-uploaded-file.php

PHP does indeed support both single-line and multi-line comments. Single-line comments can be denoted by double slashes (//) or a hash symbol (#), while multi-line comments can be enclosed between /* and */. Comments are essential for leaving notes, explaining code, or temporarily disabling blocks of code. They are ignored by the PHP interpreter, making them purely informational for developers. Learn more: https://www.php.net/manual/en/language.basic-syntax.comments.php

The json_decode() function in PHP is used to decode a JSON object into a PHP array. It is a standalone function that takes a JSON-encoded string and converts it into a PHP value, typically an array or an object. The correct option is "function." For more information, consult the PHP documentation on json_decode(): http://php.net/manual/en/function.json-decode.php

The method seek() of the RandomAccessFile class in Java is used to set the file-pointer offset to a specified location within the file. It allows you to navigate within the file and start reading or writing data from that position.

If a superclass is not serializable but its subclass is, attempting to serialize an object of the subclass will result in a java.io.NotSerializableException. This happens because the superclass needs to be serializable for the serialization process to work correctly. The other options are incorrect, as they imply successful serialization without issues.