Arrays in PHP
Array Construction
Arrays in PHP can be constructed using different methods:
array()construct: This is a language construct to create an array in PHP.- Array operator
[]: Using square brackets to define and initialize an array.
Array Printing
Printing arrays in PHP can be done using various functions:
print_r(): This function is used to display human-readable information about a variable, especially useful for arrays.var_dump(): A debugging function that displays structured information about variables, including type and value.var_export(): Outputs or returns a parsable string representation of a variable, mainly used for debugging arrays.
Array Operations
Performing operations on arrays in PHP involves various functions and methods:
array(key = value)andarray[key]=value: Ways to define key-value pairs in an array in PHP.- Merging arrays: Using the
+operator to merge two arrays into a new array. extract($arr, EXTR_PREFIX_ALL): Imports variables into the current symbol table from an array.count($arr, 1): Counts the number of elements in an array recursively, with the second argument to count elements in sub-arrays.
Array Cursors
PHP provides array cursor functions for easy navigation and manipulation:
reset(): Resets the internal array pointer to the first element of the array.end(): Moves the internal array pointer to the last element of the array.next(): Advances the array pointer to the next element and returns its value.prev(): Moves the array pointer to the previous element and returns its value.