Commonly used array operation functions in php (1/8)

An array is a group of elements with some common characteristics, including similarity and type.
Each element is distinguished by a special identifier, called a key, and each key has a value
1. Two ways to create an array:
1.1 Use the array () function

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<? Php $ Usernames = array ('aler', 'Mary ', 'Lucy', 'bob', 'jack', 'john', 'mark '); Foreach ($ usernames as $ name) { Echo $ name. '<br/> '; } ?> Output Alerk Mary Lucy Bob Jack John Mark

1.2 use the range () function

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<? Php $ Numbers = range (0, 10 ); Foreach ($ numbers as $ num) { Echo $ num. '<br/> '; } $ Letters = range ('A', 'z '); Foreach ($ letters as $ letter) { Echo $ letter. '<br/> '; } ?> Output 0 1 2 3 4 5 6 7 8 9 10 A C D E F G H I J K L M O Q R T U V W X Y Z

2. Two methods to access array elements cyclically:
2.1 for Loop

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<? Php // The third parameter of range indicates the step size. $ Numbers = range (1, 10, 2 ); For ($ I = 0; $ I <count ($ numbers); $ I ++) { Echo $ numbers [$ I]. '<br/> '; } ?> Output 1 3 5 7 9

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