PHP String Functions Quiz

String Functions

• String manipulation:
  • strtolower(): converts a string to lowercase
  • strtoupper(): converts a string to uppercase
  • ucfirst(): capitalizes the first character of a string
  • lcfirst(): converts the first character of a string to lowercase
• String extraction:
  • substr(): returns a portion of a string
  • substr_replace(): replaces a portion of a string
• String searching:
  • strpos(): finds the position of a substring within a string
  • strrpos(): finds the position of a substring within a string, starting from the end
• String verification:
  • empty(): checks if a string is empty
  • isset(): checks if a string is set
• String formatting:
  • trim(): removes whitespace from the beginning and end of a string
  • ltrim(): removes whitespace from the beginning of a string
  • rtrim(): removes whitespace from the end of a string

Array Functions

• Array creation:
  • array(): creates a new array
  • range(): creates an array of consecutive integers
• Array manipulation:
  • array_push(): adds one or more elements to the end of an array
  • array_pop(): removes the last element of an array
  • array_shift(): removes the first element of an array
  • array_unshift(): adds one or more elements to the beginning of an array
• Array searching:
  • in_array(): checks if a value exists in an array
  • array_search(): searches for a value in an array and returns its key
• Array sorting:
  • sort(): sorts an array in ascending order
  • rsort(): sorts an array in descending order
  • asort(): sorts an array in ascending order, maintaining key associations
  • ksort(): sorts an array by key in ascending order
• Array filtering:
  • array_filter(): filters elements of an array using a callback function
  • array_diff(): returns an array of elements that are not present in another array

String Functions

• String manipulation:
  • strtolower() converts a string to lowercase
  • strtoupper() converts a string to uppercase
  • ucfirst() capitalizes the first character of a string
  • lcfirst() converts the first character of a string to lowercase
• String extraction:
  • substr() returns a portion of a string
  • substr_replace() replaces a portion of a string
• String searching:
  • strpos() finds the position of a substring within a string
  • strrpos() finds the position of a substring within a string, starting from the end
• String verification:
  • empty() checks if a string is empty
  • isset() checks if a string is set
• String formatting:
  • trim() removes whitespace from the beginning and end of a string
  • ltrim() removes whitespace from the beginning of a string
  • rtrim() removes whitespace from the end of a string

Array Functions

• Array creation:
  • array() creates a new array
  • range() creates an array of consecutive integers
• Array manipulation:
  • array_push() adds one or more elements to the end of an array
  • array_pop() removes the last element of an array
  • array_shift() removes the first element of an array
  • array_unshift() adds one or more elements to the beginning of an array
• Array searching:
  • in_array() checks if a value exists in an array
  • array_search() searches for a value in an array and returns its key
• Array sorting:
  • sort() sorts an array in ascending order
  • rsort() sorts an array in descending order
  • asort() sorts an array in ascending order, maintaining key associations
  • ksort() sorts an array by key in ascending order
• Array filtering:
  • array_filter() filters elements of an array using a callback function
  • array_diff() returns an array of elements that are not present in another array