PHP Array Usage Rules analysis
This article mainly introduces the use of PHP array rules, example analysis of the usage of the array in PHP, with a certain reference value, the need for friends can refer to the following
This paper analyzes the rules of using arrays in PHP. Share to everyone for your reference. The specific analysis is as follows:
The array is in the gray-most important position in PHP. strings, pictures, digital, video equivalents exist in the form of arrays, so it is necessary to understand the various rules of the array.
1, key, value.
The basic form of an array:
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Array ([key =>] Value , ... ) |
Key=>value, where key can only be two, integer, String. While value can be in various forms, except for numbers, all other values must be "or" to enclose the string. The following example illustrates the rule:
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$a = Array ( -1=>2, -2=>3, ' 99.jpg ', 8, ' A ', ' B ' =>true, Null "", 1.2=>0.5, ); Print_r ($a); ?> |
Output: Array ([-1] = 2 [-2] = 3 [] = 99.jpg [0] = 8 [1] = 0.5 = 1 [2] = [3] = =)
I hope this article is helpful to everyone's PHP programming.
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