PHP

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PHP
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PHPHypertext-Preprocessor

• What is PHP?
• PHP is a widely-used Open Source
  general-purpose scripting language that is
  especially suited for Web development and can be
  embedded into HTML.

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PHP (contd)

• An introductory example
• lthtmlgt   ltheadgt       lttitlegtExamplelt/titlegt 
   lt/headgt   ltbodygt       lt?php        echo "Hi,
  I'm a PHP script!"        ?gt   lt/bodygtlt/htmlgt
  
  res

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What can PHP do?

• PHP can collect form data, generate dynamic page
  content, or send and receive cookies.
• It concentrates mainly in three areas
• 1.Server-side scripting.
• 2.Command line scripting
• 3.Writing desktop applications

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Arrays and Array Functions

• What is an Array?
• Arrays are essential for storing, managing,
  and operating on sets of variables. An array in
  PHP is actually an ordered map. A map is a type
  that maps values to keys.

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Arrays Array Functions (contd)

• Syntax
• An array can be created by the array()
  language-construct. It takes a certain number of
  comma-separated key gt value pairs.
• array( key gt value    , ...    )//
  key may be an integer or string// value may be
  any value

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Arrays Array Functions (contd)

• Example 1(ar1.php)
• lt?phparr array("foo" gt "bar", 12 gt
  true)echo arr"foo" // barecho arr12  
   // 1?gt
  res

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Arrays Array Functions (contd)

• Example 2(ar2.php)
• lt?phparr array("somearray" gt array(6 gt
  5, 13 gt 9, "a" gt 42))echo arr"somearray"6
     // 5echo arr"somearray"13   // 9echo
  arr"somearray""a"  // 42?gt
  res

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Arrays Array Functions (contd)

• Example 3(ar3.php)
• lt?php// This array is the same as
  ...array(5 gt 43, 32, 56, "b" gt 12)//
  ...this arrayarray(5 gt 43, 6 gt 32, 7 gt 56,
  "b" gt 12)?gt
  res

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Arrays Array Functions (contd)

• Example 4(ar4.php)
• arr array(5 gt 1, 12 gt 2)
• The unset() function allows unsetting keys of
  an array
• unset(arr5) // This removes the element
  from the arrayunset(arr)    // This deletes
  the whole array?gt
  res
  

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Arrays Array Functions (contd)

• Example 5(ar5.php)
• Create a simple array.Now delete every
  item, but leave the array itself intact.
• Append an item (note that the new key is 5,
  instead of 0 as you might expect).
• Re-index.
  res

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Arrays Array Functions (contd)

• Example 6(ar6.php)
• Illustration of multi dimensional array
• 
  res

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Arrays Array Functions (contd)

• array_change_key_case(array,case)
• This function returns an array with all array
  KEYS in lower case or upper case.
• Example(ar7.php) res

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Arrays Array Functions (contd)

• array_chunk(array,size,preserve_key)
• This function splits an array into chunks of
  new arrays.
• Example(ar8.php) res

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Arrays Array Functions (contd)

• array_diff(array1,array2,array3...)
• This function compares two or more arrays, and
  returns an array with the keys and values from
  the first array, only if the value is not present
  in any of the other arrays.
• Example(ar9.php) res

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Arrays Array Functions (contd)

• array_fill(start,number,value)
• This function returns an array filled with the
  values you describe.
• Example(ar10.php) res

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Arrays Array Functions (contd)

• array_flip(array)
• This function returns an array with all the
  original keys as values, and all original values
  as keys.
• Example(ar11.php) res

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Arrays Array Functions (contd)

• array_intersect(array1,array2,array3...)
• This function compares two or more arrays, and
  returns an array with the keys and values from
  the first array, only if the value is present in
  all of the other arrays.
• Example(ar12.php) res

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Arrays Array Functions (contd)

• array_key_exists(key,array)
• This function checks an array for a specified
  key, and returns true if the key exists and false
  is the key does not exist.
• Example(ar13.php) res

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Arrays Array Functions (contd)

• array_merge (array1,array2,array3...) This
  function merges one or more arrays into one array
  . It returns the resulting array.
• Example(ar14.php) res

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Arrays Array Functions (contd)

• array_multisort(array1,array2,array3...)
• This function returns a sorted array. You can
  assign one or more arrays. The function sorts the
  first array, and the other arrays follow, then,
  if two or more values are the same, it sorts the
  next array, and so on.
• Example(ar15.php) res

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Arrays Array Functions (contd)

• array_pad(array,size,value)
• This function inserts a specified number of
  elements, with a specified value, to an array.
• Example(ar16.php) res

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Arrays Array Functions (contd)

• array_pop(array)
• This function deletes the last element of an
  array.
• Example(ar17.php) res

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Arrays Array Functions (contd)

• array_product(array)
• This function calculates and returns the
  product of an array.
• Example(ar18.php) res
  

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Arrays Array Functions (contd)

• array_push(array,value1,value2...)
• This function inserts one or more elements to
  the end of an array.
• Example(ar19.php) res

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Arrays Array Functions (contd)

• array_reverse(array,preserve)
• This function returns an array in the reverse
  order.
• Example(ar20.php) res

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Arrays Array Functions (contd)

• array_search(value,array,strict)
• This function search an array for a value and
  returns the key.
• Example(ar21.php) res

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Arrays Array Functions (contd)

• array_shift(array)
• This function removes the first element from an
  array, and returns the value of the removed
  element.
• Example(ar22.php) res

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Arrays Array Functions (contd)

• array_sum(array)
• This function returns the sum of all the values
  in the array.
• Example(ar23.php) res

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Arrays Array Functions (contd)

• array_unique(array)
• This function removes duplicate values from
  an array.
• Example(ar24.php)
  res

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Arrays Array Functions (contd)

• asort(array,sorttype)
• This function sorts an array by the values. The
  values keep their original keys.
• Example(ar25.php) res

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Resource

• http//www.w3schools.com/php/php_ref_array.asp