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If you are new to PHP or just need to refresh your skills, this is the place to start. This series of tutorials will give you the basic knowledge you will need to create a simple PHP website.

PHP is a reflective programming language originally designed for producing dynamic web pages.[1] PHP is used mainly in server-side scripting, but can be used from a command line interface or in standalone graphical applications. Textual User Interfaces can also be created using ncurses.

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array_rand

(PHP 4, PHP 5)

array_rand -- Pick one or more random entries out of an array

Description

mixed array_rand ( array input [, int num_req] )

array_rand() is rather useful when you want to pick one or more random entries out of an array. It takes an input array and an optional argument num_req which specifies how many entries you want to pick - if not specified, it defaults to 1.

If you are picking only one entry, array_rand() returns the key for a random entry. Otherwise, it returns an array of keys for the random entries. This is done so that you can pick random keys as well as values out of the array.

Note: As of PHP 4.2.0, there is no need to seed the random number generator with srand() or mt_srand() as this is now done automatically.

Example 1. array_rand() example


<?php
srand((float) microtime() * 10000000);
$input = array("Neo", "Morpheus", "Trinity", "Cypher", "Tank");
$rand_keys = array_rand($input, 2);
echo $input[$rand_keys[0]] . "\n";
echo $input[$rand_keys[1]] . "\n";
?>

See also shuffle().

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Another Useful functions:

zend-macro.zend-arg-array-info | zend-api.zend-get-parameters-array | zend-api.zend-get-parameters-array-ex | zend-api.zend-copy-parameters-array | zend-api.init-op-array | zend-api.destroy-op-array | zend-api.array-init | ref.array | language.types.array | language.operators.array | function.udm-alloc-agent-array | function.sybase-fetch-array | function.sqlite-fetch-array | function.sqlite-array-query | function.sesam-field-array | function.sesam-fetch-array | function.pg-fetch-array | function.odbc-fetch-array | function.oci-fetch-array | function.oci-bind-array-by-name | function.mysqli-fetch-array | function.mysql-fetch-array | function.mssql-fetch-array | function.msql-fetch-array | function.msession-set-array | function.msession-get-array | function.maxdb-fetch-array | function.iterator-to-array | function.is-array | function.ingres-fetch-array | function.in-array | function.hw-objrec2array | function.hw-array2objrec | function.httpquerystring-toarray | function.filter-var-array | function.filter-input-array | function.fbsql-fetch-array | function.db2-fetch-array | function.curl-setopt-array | function.call-user-method-array | function.call-user-func-array | function.arrayobject-offsetunset | function.arrayobject-offsetset | function.arrayobject-offsetget | function.arrayobject-offsetexists | function.arrayobject-getiterator | function.arrayobject-count | function.arrayobject-construct | function.arrayobject-append | function.arrayiterator-valid | function.arrayiterator-seek | function.arrayiterator-rewind | function.arrayiterator-next | function.arrayiterator-key | function.arrayiterator-current | function.array | function.array-walk | function.array-walk-recursive | function.array-values | function.array-unshift | function.array-unique | function.array-uintersect | function.array-uintersect-uassoc | function.array-uintersect-assoc | function.array-udiff | function.array-udiff-uassoc | function.array-udiff-assoc | function.array-sum | function.array-splice | function.array-slice | function.array-shift | function.array-search | function.array-reverse | function.array-reduce | function.array-rand | function.array-push | function.array-product | function.array-pop | function.array-pad | function.array-multisort | function.array-merge | function.array-merge-recursive | function.array-map | function.array-keys | function.array-key-exists | function.array-intersect | function.array-intersect-ukey | function.array-intersect-uassoc | function.array-intersect-key | function.array-intersect-assoc | function.array-flip | function.array-filter | function.array-fill | function.array-fill-keys | function.array-diff | function.array-diff-ukey | function.array-diff-uassoc | function.array-diff-key | function.array-diff-assoc | function.array-count-values | function.array-combine | function.array-chunk | function.array-change-key-case |

PHP is a widely-used general-purpose scripting language that is especially suited for Web development and can be embedded into HTML. If you are new to PHP and want to get some idea of how it works, try the introductory tutorial. After that, check out the online manual, and the example archive sites and some of the other resources available in the links section.