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Working with arrays in php
- 1. Working with arrays ArrayBasics Looping Through Arrays Modifying Arrays Sorting Arrays Using Multidimensional Arrays
- 2. Array Basics • Arraysare collections of related values • the data submitted from a form, • the names of students in a class, • the populations of a list of cities. • An array is a container that holds multiple values, each distinct from the rest. • Made up of elements • Each elements has key and value • Only one element with the given key
- 3. • Arrays andother non-scalar values can’t be keys but they can be elements • Element value can be strings, numbers, true or false or can be other array
- 4.
- 5. Creating arrays witharray( )
- 6. Choosing a goodarray name • Follow same rules as variables names • Scalars and array cannot have the same names • $a cannot be of both scalar and array type
- 7. Numeric array • Arrayswith numeric keys • Also called indexed or ordered array • Keys signify the position
- 8. Creating a numericarray
- 10.
- 14. Finding the Sizeof an Array
- 16. Looping through arrays •foreach() • works only on arrays • used to loop through each key/value pair • Syntax • foreach ($array as $value) { code to be executed; } • for() • used when you know in advance how many times the script should run • Syntax • for (init counter; test counter; increment counter) { code to be executed; }
- 17.
- 21. Alternating table rowscolors
- 23. Modifying an arraywith foreach()
- 25. Using foreach( )with numeric arrays
- 27. Iterating through anumeric array with for( )
- 29. Alternating table rowcolors with for( )
- 31. Array element orderand foreach( )
- 33. • To guaranteethat elements are accessed in numerical key order, use for( )
- 35. Checking for anelement with a particular key
- 37. Checking for anelement with a particular value
- 39. Modifying Arrays • Operatingon array elements • Interpolating array element values in double-quoted strings • Interpolating array element values with curly braces • Making a string from an array with implode( ) • Printing HTML table rows with implode( ) • Turning a string into an array with explode( )
- 40. Operating on arrayelements
- 42. Interpolating array elementvalues in double- quoted strings
- 44. Interpolating array elementvalues with curly braces
- 46.
- 48. implode • The implode()function returns a string from the elements of an array. • Syntax • implode(separator,array)
- 49. Making a stringfrom an array with implode( )
- 51. Printing HTML tablerows with implode( )
- 53. Turning a stringinto an array with explode( )
- 55. Sorting Arrays • Sortingwith sort( ) • Sorting with asort( ) • Sorting with ksort( ) • Sorting with arsort( )
- 56.
- 58.
- 60.
- 62. • rsort( ) •arsort( ) • krsort( ) • Sort the arrays in descending order or reverse alphabetical order
- 63.
- 65. Using Multidimensional Array •Creating multidimensional arrays with array( ) • Accessing multidimensional array elements • Manipulating multidimensional arrays • Iterating through a multidimensional array with foreach( ) • Iterating through a multidimensional array with for( )
- 66. Creating multidimensional arrayswith array( )
- 68. Accessing multidimensional arrayelements
- 70.
- 72. Iterating through amultidimensional array with foreach( )
- 74. Iterating through amultidimensional array with for( )