Php basic knowledge Summary (1) array, basic knowledge array
I. Sorting1. asort-Positive Sorting to maintain the index relationship2. arsort-reverse sorting to maintain the index relationship3. sort -- sorting from the lowest to the highest4. ksort -
Array pointer operation: Moves the array pointer operation: Next () down Gets the value of the current element. Prev () will also get the value of the current element. End () moves to the last element cell to get the value of the last element reset (
Insert an element program code into the array in php. This article is a sorted two-dimensional data. we need to insert an element into the array, which needs to be sorted after being saved to the data. The code is as follows: Copy the code? In this
In java, the index of an array must be a number, and the number of arrays must be determined when the array is declared. Php is more flexible. indexes can make numbers or strings, and the number of arrays can be changed at will.
Objective: to
How to transmit a json Array to php through ajax and insert data into the database through php is as follows. I just started to learn php, and the basics are not good. Baidu has been unable to implement it for a long time. I hope to give an example.
An array is a variable that can store a group or a series of values. * Arrays are a basic data type. Array functions can also implement data structures such as stacks and queues. Subscript: the identifier of an array, that is, the code of a string
Subscript: The identifying name in the array is the code of the string or integer in the array
Several index values in an array are referred to as several-dimensional arrays.
Index value: An index is a structure that sorts the values of one or more
Common PHP array functions
I. basic functions of array operations
Key name and value of the array
Array_values ($ arr); obtain the array value array_keys ($ arr); obtain the array key name array_flip ($ arr ); values in the array are exchanged
PHP sorts the array values by using another container and php array. PHP sorts the array values and uses another container. php sorts the array values and uses another container? Php * sorting method: in fact, you only need to sort the array values
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