August 2000
Intermediate to advanced
800 pages
13h 15m
English
Content preview from Core PHP Programming: Using PHP to Build Dynamic Web SitesBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Quicksort
Invented by Professor C.A.R. Hoare in 1961, quicksort has proven to be the best general-purpose sorting algorithm. Many computer languages offer a library version, and PHP uses it for its built-in sorting functions. It is based on the same idea of exchanging elements, but adds the concept of partitioning. In most implementations it relies on recursion, a topic discussed in Chapter 4.
The quicksort algorithm chooses a pivot element and then divides all elements by whether they are greater or lesser than the pivot. Each subsection is further divided similarly. When the granularity becomes small enough, elements are simply compared and possibly swapped, as in the bubble sort.
When we first call the quicksort function in Listing 15.2, we ...
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