PHP Knowledge Points Summary

Summary of PHP knowledge points

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PHP Knowledge Point Summary:

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1. Get the data submitted by the client utility $_post[];

? ? $str =$_post[' name '];

2. Implement two arrays of intersection, and, difference function:

? ? Array_intersect ($array 1, $array 2); (Intersection function)

? ? Array_diff ($array 1, $array 2); (difference set function)

? ? Array_merge ($array 1, $array 2); (Set function)

3. Functions for outputting array elements:

?? $fruit =array ("Lemon", "orange", "banana");

? ? Print_r ($fruit);

The result is: Array ([0]=>lemon [1]=>orange [2]=>banana];

4. Array sorting:

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"; Print_r ($array); Echo Implode ("-", $array); Sort ($array); echo "
After array sorting
"; foreach ($array as $key = + $val) {echo "array[". $key. "] = ". $val."
"; } ? >

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? The output is:

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Array sort before arrays ([0] + = ASP [1] + PHP [2] + JSP) array sorted after array[0]=asp array[1]=jsp array[2]=php

The red part, the keys and values in the PHP array

5. File read

? ? The EOF character, which the PHP program will use in a standard way to identify when to reach the end of the file, this standard is often called the end of the file, or the EOF character.

? ? The feof () function is used to determine whether the file is at the end of the position, and the fgets () function reads one line at a time, and the FSCANF () function provides a way to parse the file in the format specified, fseek (resource handle,int offset [, int whence]) function can be used to randomly extract file rows

6. Functions to obtain files, directories, and disk sizes

? ? The filesize (string filename) function is used to return the number of bytes of a file, but a file with a size greater than 2GB may experience unintended results, typically using sprintf ("%u", FileSize ($file)) to resolve

7. File Upload

? ? By using PHP's global array $_files, you can upload files from a client computer to a remote server

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$_files["File" ["Name"]-the name of the uploaded file $_files["file" ["type"]-the type of the file being uploaded $_files["file" ["Size"]-the size of the uploaded file, in bytes $_files[" File "[" Tmp_name "]-the name of the temporary copy of the file stored on the server $_files[" file "[" Error "]-error code caused by file upload

? 8. Get the size of the picture

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Array getimagesize (string $filename [, Array & $imageinfo])

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9. Time (), date (),getdate()-Get Date/time information,

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? The return value is

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now:2005-03-30 Next week:2005-04-07

The 10.header () function sends the original HTTP header to the client. Note : Before sending the packet header, there can be no other output, otherwise it will be an error?

Prompts the user to save a generated PDF file (the content-disposition header is used to provide a recommended file name and to force the browser to display the Save dialog box):

11. Several common functions of database operations

? ? mysql_connect ("localhost", "root", "root");

? ? mysql_fetch_object? -? get a row from the result set as an object

? ? mysql_query ("Set names ' GBK '");

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12.php multiple parameter pass & connection, eg:

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getimagesize ()?function will determine any?GIF,JPG,PNG,SWF,SWC,PSD,TIFF,BMP,IFF,JP2,JPX,JB2,JPC,XBM?or?WBMP?the size of the image file and returns the size of the image and the file type and one that can be used for normal?HTML?in the file?IMG?the Height/width text string in the tag.

If you cannot access?filename?the specified image, or it is not a valid image,getimagesize ()?will return?FALSE?and produce a?E_WARNING?level of error

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Returns an array with four cells. Index 0 contains the pixel value of the image width, and index 1 contains the pixel value of the image height. Index 2 is a marker of the image type: 1 = gif,2 = jpg,3 = png,4 = swf,5 = psd,6 = bmp,7 = TIFF (Intel byte order), 8 = TIFF (Motorola byte order), 9 = jpc,10 = jp2,11 = jpx,12 = jb2,13 = swc,14 = iff,15 = wbmp,16 = XBM. These tags correspond to the newly added IMAGETYPE constants of PHP 4.3.0. Index 3 is a text string with the content "height=" yyy "width=" xxx ", which can be used directly with the IMG tag.

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