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For Web programming, the most important thing is to access and read and write data. There may be many ways to store them, such as strings, arrays, files, and so on. arrays, which can be said to be a more important way of using PHP data. PHP's Array
1, the rule of reference:
A. When a level two pointer acts as a function parameter, it is a level two pointer, an array of pointers, and an address of a first-hand pointer.B. When the array pointer acts as a function parameter, the function argument
void arraysum (int a[],int b[])
{
cout cout int length_a = sizeof (a)/sizeof (int);
}
Equivalent to:
void arraysum (int *a,int *b)
{
cout cout int length_a = sizeof (a)/sizeof (int);
}
Recently wrote a few small functions, useful to
Real Development Encounters problems:
How do I pass each element of an array as an argument to a mutable parameter function?
From MySQL to find multiple data, for an array result set, eg: ['张三','李四', 'foo', 'bar'] ;
The type that needs
1. The concept of arrays
An array is a named range that is used to store a series of variable values.
Each array element has an associated index (also a keyword) that can be used to access elements.
PHP allows you to use numbers or strings evenly
There are several differences between the function parameters of an array masterpiece and the argument of an array element.
1 when an array element is used as an argument, the type of the array element as the subscript variable is also the same as
arrays, which can be said to be a more important way of using PHP data. PHP's Array function is numerous, below is my study summary, takes this to remember, facilitates later to learn.
1. Array definition
The definition of an array is defined using
basic functions of array manipulationThe key name and value of the arrayArray_values ($arr); Gets the value of the array Array_keys ($arr), gets the key name of the array array_flip ($arr), and the values in the array are exchanged with the key
Focus:1. Each time the function is called, its formal parameters are recreated and the parameters are initialized with the passed-in arguments.Note: the mechanism of formal parameter initialization is the same as the initialization of variables. 2.
Basic functions of array manipulationThe key name and value of the arrayArray_values ($arr); Get the value of an arrayArray_keys ($arr); Gets the key name of the arrayArray_flip ($arr); the values in the array are exchanged with the key names (if
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