PHP – filter_has_var() Function
The PHP filter_has_var() function checks whether a variable of a specified input type exists.
PHP – filter_id() Function
The PHP filter_id() function returns filter ID of a specified filter name.
PHP – filter_input() Function
The PHP filter_input() function gets an external variable from insecure sources (e.g., user input) and optionally filters it to validate variables.
PHP – filter_input_array() Function
The PHP filter_input_array() function gets external variables (e.g. from form input) and optionally filters them.
PHP – filter_list() Function
The PHP filter_list() function returns a list of all the supported filter names.
PHP – filter_var() Function
The PHP filter_var() function filters a variable with the specified filter.
PHP – filter_var_array() Function
The PHP filter_var_array() function gets multiple variables and optionally filters them.
PHP – final Keyword
The PHP final keyword is used to prevent a class from being inherited and to prevents inherited methods from being overridden.
PHP – finally Keyword
The PHP finally keyword is used in try…finally and try…catch…finally structures to run a block of code whether or not an exception occurred.
PHP – floor() Function
The PHP floor() function rounds a number DOWN to the nearest integer, if necessary, and returns the result.
PHP – fnmatch() Function
The PHP fnmatch() function checks if a string or filename matches the given shell wildcard pattern.
PHP – fn Keyword
The PHP fn keyword is used to create arrow functions which have access to all variables from the scope in which they were created.
PHP – for Keyword
The PHP for keyword is used to create a for loop, which loops through a block of code a specified number of times.
PHP – fpassthru() Function
The PHP fpassthru() function reads from the current position in a file – until EOF, and then writes the result to the output buffer.
PHP – fputcsv() Function
The PHP fputcsv() function formats a line as CSV and writes it to an open file.
PHP – fread() Function
The PHP fread() reads from an open file and stops at the end of the file or when it reaches the specified length (whichever comes first).
PHP – foreach Keyword
The PHP foreach keyword is used to create foreach loops, which loops through a block of code for each element in an array.