Common operators and operators in php

& Lt ;? Php * operator number (PHP) operator symbol ** is divided: * 1. arithmetic operators +-* % +-* 2. string operators connected to operators * 3. value assignment operators +-* %

2. /* Operator number (PHP) operator symbol
3. *
4. * By operator number:
5. * 1. arithmetic operators +-*/% + + --
6. * 2. string operators. Concatenation Operators
7. * 3. value assignment operator = + =-= * =/= % =. =
8. * 4. Comparison operators >======! = <>! =
9. * Comparison operator --- condition operator --- relational operator
10. * There is only one comparison result: boolean true false
11. * === The comparison requires the same content and type
12. *! = When compared, the content is not the same and the type is also required.
13. * 5. logical operators & and | or! Or not
14. * Logical operators can only operate bool-type values, and return bool-type values.
15. * 6. bitwise operators & | ^ ~ <>>>>
16. * 7. Other operators? : ''@ =>->::& $
17. * ''Is used to execute the operating system kernel.
18. * @ Used to block error messages
19. * We recommend that you use "()" to change the expression priority.
20. *
21. * % Has two purposes: Division operation; control range; do not use decimal places or negative numbers
22. * % Convert the numbers on both sides of the operator into integers and perform the remainder division.
23. */
24. // Use the % symbol to determine the leap year
25.  
26. $ Year = 2011;
27. If ($ year % 4 = 0 & % year % 100! = 0) | $ year % 400 = 0)
28. {
29. Echo "run nian ";
30. }
31. Else
32. {
33. Echo "not run nian ";
34. }
35.  
36.  
37. // ++ -- Use of symbols
38. $ A = 10;
39. $ A ++; // $ a = $ a + 1; first use a variable and then increase by 1
40. + + $ A; // $ a = $ a + 1; first, auto-Increment 1.
41. $ A --; // $ a = $ A-1; use variables first, then subtract 1
42. -- $ A; // $ a = $ A-1; first auto minus 1, then variable
43. Echo $ a; // The result is 10.
44.  
45. // ++ -- Differences in operations
46. $ A = 10;
47. $ B = $ a ++; // B = 10, a = 11
48. $ C = -- $ B; // c = 9, B = 9
49. $ D = $ c ++ $ c; // d = 20, c = 11
50. $ E = $ d ----- $ d; // d = 18, e = 2
51. Echo $ d;
52.  
53.  
54. // Use of the string operator.
55. $ Name = "tom ";
56. $ Age = 27;
57. $ Height = 1.75;
58. Echo "My name is: {$ name} my age is: {$ age} my height is: {$ height} meters
    ";
59. Echo 'My name is: '. $ name.' My age is: '. $ age.' My height is: '. $ height. 'MI '.'
    ';
60. Echo "$ age =". $ age; // $ age = 27
61.  
62. Echo "My name is: {$ name} my age is: {$ age} my height is: {$ height} meters
    "; // Use of the value assignment operator
63.  
64. $ A = 10;
65. $ A + = 10; // $ a = $ a + 10;
66. $ A-= 10; // $ a = $ A-10;
67. $ A * = 10 ;//...
68. $ A/= 10 ;//...
69. $ A % = 10; // $ a = $ a % 10;
70. $ A. = "abc"; // $ a = $ a. "abc ";
71. Echo $;
72. $ Str ='
73. $ Str. ='
74. $ Str. ='
75. $ Str. ='
76. $ Str. ='
'; '; '; ';

'; $ Str. ='

';
77. Echo $ str; // output a table
78. // Comparison operator
79. Var_dump (15> 6); // return bool (true)
80. $ A = 15;
81. If (15 = $)
82. {
83. Echo "a = 15 ";
84. }
85. Else
86. {
87. Echo "! = 15 ";
88. }
89.  
90.  
91. // Use of logical operators
92. Var_dump (true & true); // true
93. Var_dump (true & false); // false
94. Var_dump (true | false); // true
95. Var_dump (! True); // false
96. Var_dump (! False); // true
97. // Determine the user name and password
98. $ Username = "admin ";
99. $ Password = "123456 ";
100. $ Email = "290080604@qq.com ";
101. If ($ username = "admin" & $ password = "123456 ")
102. {
103. Echo "the user name and password are correct ";
104. }
105. If ($ username = "" | $ password = "" | $ email = "")
106. {
107. Echo "none of them can be blank ";
108. }
109. ?>