PHP basic Syntax chapter II _php Tutorial

One, how to define a constant

Keyword: Define syntax define (' Constant name ', ' constant value ')

Two, array

1 Defining an array

The keyword array Syntax array (KEY=>VALUE,KEY2=>VALUE2,KEY3=>VALUE3) key can be an integer or string, value can be any value

' Bar ', 123=>true); echo $arr [' too ']. '
'; echo $arr [123];?>

Method of printing an array print_r keyword: print_r syntax print_r (to print group name), mainly for debugging

' 10010 ', ' stu_name ' = ' Lao Zhao '; Print_r ($stu);?> output result Array ([stu_no] = 10010 [Stu_name] = Lao Zhao)

Output method echo $ array name [key]

' 10010 ', ' stu_name ' = ' Lao Zhao '; echo $stu [' stu_no ']. '
'; echo $stu [' stu_name '];?> output results

10010

Lao Zhao

Another way to define an array is to directly enter the value values key for shaping from 0

Array (' value ', ' value2 ', ' value3 ', ' value4 ')

The output is an array ([0] = phi [1] = Lele [2] = = Pope [3] = (Lao Zhao)

Output separately:

'; echo $stu [1]. '
'; Echo $stu [2]. '
'; Echo $stu [3]. '
';?> output results

Del piero

Lele

Pope

Lao Zhao

Loop output method for statement syntax

for (cyclic condition) Example: $i =0; $i <4; $i + +

{

echo $ array name [loop variable name]

}

'; }?> Output Results

Del piero

Lele

Pope

Lao Zhao

While loop syntax

$ condition Variable name = condition Variable Value

while (conditional statement) example $i<4

{

$ array name [$ condition variable name];

$ conditional Variable + +

}

Output results Skin Pile Pope Lao Zhao

Add an element at the end of an array

Syntax $ array name =ARRAY[VALUE,VALUE1,VALUE2,VALUE3];

$ array name []= the value to add;

$ array name []= the value to add;

Output results skin Pile Pope old Chao Haomin Scottish Lu Teng

Create a range of array range and count methods to get how many elements are in the array

Syntax $ array name =range (range start, Range end)

Count ($ array name)

Output 1 2 3 4 5 6 7 8 9 10 11 12

Output result a b c d e F g h i j k l m n o p q R S t u v w x y Z

Three-padding array

Array_pad

Grammar

Array_pad ($ array name, array length, padding default value)

Output 0 1 2 3 0 0 0

Five, delete and insert replacement elements in the array array_splice

Array_splice two parameters for delete four parameters for insert or replace (the third parameter is 0 when inserting, not 0 is replaced)

Delete Syntax Array_splice ($ array name, delete end subscript) subscript equals Delete before this key

Output 5 6 7 8 9 10 11 12

Insert Syntax Array_splice ($ is inserted array name, subscript, 0,$ Insert new array name) subscript to insert a new array before this subscript to the previous

Output 0 1 2 3 4 a B C 5 6 7 8 9 10 11 12

Replace syntax Array_splice ($ replaced by array name, key,key2,$ Replace with new array name) Subscript 1 Subscript 2 is combined to represent the number of subscripts starting from subscript key key2 elements are replaced by a new array

Output is 0 1 2 a b C 9 10 11 12

Starting from 3, the number of 6 elements is replaced with a,b,c

This article is from the "PHP Learning Notes" blog

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