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Web Systems Development (CSC-215)
Lecture 5: PHP Arrays Wednesday 14th February 2018
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Class Test 1 Monday 19th February
Lab based – bring laptops or have desktop ready Lectures 1-6 Duration: 30 minutes
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Adding Items to an Array
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Adding Items to an Array
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Retrieval
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Associative Arrays
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Example Useful for inserting/extracting information into/from HTML and XML
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Assignment (using array keyword)
(more organized way)
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foreach … as loop for arrays
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For each with associative arrays
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To modify, use as reference
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Alternative, list & each function
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Arrays Multidimensional
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Direct Access
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Multidimensional, Indexed
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Array functions
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Array Functions: is_array
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Array Functions: count (counts number of elements)
For multi-dimensional 0 – only top level 1 – count all elements
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Array Functions: sort (lowest to highest)
Sorts in place, returns TRUE or FALSE depending on success
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Variations on sort
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Array Functions: shuffle
In place, returns TRUE or FALSE
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Array Functions: explode
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Array Functions: explode
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Array Functions: extract
Turns key/value pairs from an array into PHP variables For example, processing $_GET or $_POST variables A query string parameter q for example will get placed into a variable named $q
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Avoid Overwriting $q becomes $fromget_q
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Array Functions: compact (inverse of extract)
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Array Functions: reset
Internal pointer in foreach
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Array Functions: end Internal pointer in foreach
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Lab Activity Imagine you are writing a version of the computer game Minesweeper. Use arrays to create and store a minefield on a 20 x 20 grid. Place ten mines randomly on the grid, then display the grid, using asterisks (* ) for the mines and dots (.) for the empty squares. (Hint: To return a random number between 0 and 19 inclusive, use rand( 0, 19 ) .) Your array should be populated using a nested loop (do not hard code like the chess example) Your script should display a new random configuration every time it is reloaded
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Lab Activity Sample Output
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Lecture content adapted from chapter 6 of Learning PHP, MySQL, JavaScript, CSS & HTML5, 3rd Edition, by Robin Nixon.
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