thinkphp system built-in single letter function function

There are many important functions in thinkphp, most of which are single-letter functions that play a significant role in the development experience.
There is a saying is very incisive: concentrated is the essence! This is definitely TP's single letter method of True portrayal, used by you must understand!

In order to make it easy for everyone to learn and master, here is a summary of the thinkphp in the classic function usage, whether you are senior or rookie tper, you must not miss Oh ^_^
A function: Instantiating A Controller
R function: How to call the controller directly
C functions: Setting and getting configuration parameters
L functions: Setting and getting language variables
D function: Instantiating a model
M function: Instantiate the model (no model classes are defined)
N Function: Counter
G function: Debug statistics
U function: URL address generation
I function: Secure access to system input variables
S function: Cache Settings and Access
F function: Fast Cache settings and access
Session Function: Session operation
Cookie function: Cookie manipulation

Import function: Class Library imports

A function: Used to instantiate the action format: [Project://][Group/] Module

1. /**
2.  * The  a function is used to instantiate the action  format: [Project://][Group/] module
3.  *  @param  string  $name  action Resource address
4.  *  @param   string  $layer   Control layer name
5.  *  @param  boolean   $common   Whether public directory
6.  *  @return  action|false
7.  */
9. a ( $name , $layer = ", $common =

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b function: Perform a behavior

1. /**
2. * Perform an action
3. * @param string $name behavior name
4. * @param Mixed $params parameters passed in
5. * @return void
6. */
8. B($name, &$params=NULL)

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C function: Get and Set configuration parameters support Batch Definition

1. /**
2. * Get and Set configuration parameters support Batch Definition
3. * @param string|array $name Configuration variables
4. * @param mixed $value configuration values
5. * @return Mixed
6. */
8. C($name=null, $value=null)

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D function: Used to instantiate the model format item://Group/module

1. /**
2. * The D function is used to instantiate the model format item://Group/module
3. * @param string $name model resource Address
4. * @param string $layer business layer Name
5. * @return Model
6. */
8. D($name=",$layer=")

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F function: Fast file data read and save for simple type data strings, arrays

2. /**
4. * Fast file data reading and saving for simple type data strings, arrays
6. * @param string $name cache name
8. * @param mixed $value Cache value
10. * @param string $path cache path
12. * @return Mixed
14. */
18. F($name, $value=", $path=data_path)

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G Functions: Recording and statistical time (microseconds) and memory usage

2. /**
4. * Recording and statistical time (microseconds) and memory usage
6. * How to use:
8. * <code>
10. * G (' begin '); Record start tag bit
12. * // ... Interval Run code
14. * G (' end '); Record end tag Bit
16. * Echo G (' Begin ', ' End ', 6); Statistics interval run time is accurate to 6 digits after decimal
18. * Echo G (' Begin ', ' End ', ' m '); Statistical interval Memory Usage
20. * If the end tag bit is not defined, it will be automatically marked as the current marker bit
22. * Where statistics memory usage requires MEMORY_LIMIT_ON constant is true only valid
24. * </code>
26. * @param string $start start tag
28. * @param string $end end tag
30. * @param integer|string $dec decimal digits or M
32. * @return Mixed
34. */
38. G($start,$end=",$dec=4)

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I function: Get input parameters support filtering and default values

2. /**
4. * Get input parameters to support filtering and default values
6. * How to use:
8. * <code>
10. * I (' id ', 0); Get ID parameter automatically determine get or post
12. * I (' post.name ', ' ', ' htmlspecialchars '); Get $_post[' name ']
14. * I (' get. '); Get $_get
16. * </code>
18. * @param string $name The name of the variable supports the specified type
20. * @param the default value when the mixed $default does not exist
22. * @param mixed $filter parameter filtering method
24. * @return Mixed
26. */
30. I($name,$default=",$filter=null)

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L Functions: Get and set language definitions (case insensitive)

1. /**
2. * Get and set language definitions (case insensitive)
3. * @param string|array $name language variables
4. * @param string $value language value
5. * @return Mixed
6. */
8. L($name=null, $value=null)

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m function: Used to instantiate a model without a modeling file

2. /**
4. * The M function is used to instantiate a model without a modeling file
6. * @param string $NAME model name supports specifying the underlying model such as Mongomodel:user
8. * @param string $tablePrefix table prefix
10. * @param mixed $connection database connection information
12. * @return Model
14. */
18. M($name=", $tablePrefix=",$connection=")

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n functions: Set up and get statistical data

2. /**
4. * Set up and get statistical data
6. * How to use:
8. * <code>
10. * N (' db ', 1); Number of database operations logged
12. * N (' read ', 1); Record number of reads
14. * Echo N (' db '); Get all operations for the current page database
16. * Echo N (' read '); Gets the current page read count
18. * </code>
20. * @param string $key identify the location
22. * @param integer $step step value
24. * @return Mixed
26. */
30. N($key, $step=0,$save=false)

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R functions: How to invoke modules remotely URL parameter format [project://][Group/] Module/operation

2. /**
4. * Operation method of Remote Call module URL parameter format [project://][Group/] Module/operation
6. * @param string $url call Address
8. * @param string|array $vars Call parameters support strings and arrays
10. * @param string $layer The name of the control layer to invoke
12. * @return Mixed
14. */
18. R($url,$vars=array(),$layer=")

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s function: Cache management

1. /**
2.  *   Cache Management
3.  *  @param  mixed  $name   cache name, If the array represents the cache setting
4.  *  @param  mixed  $value   Cache values
5.  *  @param  mixed  $options   Cache parameters
6.  *  @return  mixed
7.  */
9. s ( $name , $value = ", $options =null) &NBSP;

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T function: Get template file Format item://Group @ theme/module/operation

1. /**
2. * Get template file Format item://Group @ theme/module/operation
3. * @param string $name template resource Address
4. * @param string $layer view layer (directory) name
5. * @return String
6. */
8. T($template=",$layer=")

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u function: URL assembly supports different URL patterns

2. /**
4. * URL assembly supports different URL patterns
6. * @param string $url URL expression, format: ' [group/module/Operation # Anchor @ domain name]? parameter 1= value 1& parameter 2= value 2 ... '
8. * @param string|array $vars parameters passed in, supports arrays and strings
10. * @param string $suffix pseudo-static suffix, which by default is true to get the configuration value
12. * @param boolean $redirect whether to jump, if set to true to jump to the URL address
14. * @param boolean $domain whether the domain name is displayed
16. * @return String
18. */
22. U($url=',$vars=',$suffix=true,$redirect= false,$domain=false)

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W function: Render output widget

2. /**
4. * Render Output Widget
6. * @param string $name widget name
8. * @param array $data parameters passed in
10. * @param boolean $return whether to return content
12. * @param string $path widget path
14. * @return void
16. */
20. W($name, $data=array(), $return=false,$path=" )

thinkphp system built-in single letter function function