Summary of PHP functions

• PHP refers to PHP: Hypertext Preprocessor (Translator note: Php:hypertext preprocessor, recursive naming)
• PHP is a server-side scripting language, similar to ASP
• PHP scripts are executed on the server
• PHP supports many databases (MySQL, Informix, Oracle, Sybase, Solid, PostgreSQL, Generic ODBC, etc.)
• PHP is an open source software (open source Software,oss)
• PHP is free to download and use

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Header ("content-type:text/html;charset=gb2312");

Echo: outputs one or more string eg:echo ("Hello World");

Define: Defining constants

Global: Globally variable

<?php

$val 1= "Hello World";

$val 2= "PHP";

function test ()

{

echo $val 1. " <br> ";

Global $val 2;

echo $val 2. " <br> ";

}

?>

print-- Output String

die-- equivalent to exit ()

printf-- Output formatted string

trim-- Remove whitespace characters (or other characters) from the beginning and end of a string

<?php

Function Trim_value (& $value)

{

$value = Trim ($value);

}

$fruit = Array (' Apple ', ' banana ', ' cranberry ');

Var_dump ($fruit);

Array_walk ($fruit, ' trim_value ');

Var_dump ($fruit);

?>

rtrim-- Delete whitespace characters (or other characters) at the end of a string

ltrim-- Delete whitespace characters (or other characters) at the beginning of a string

Str_pad- fills a string with another string for a specified length

str_replace- substring substitution

addslashes- referencing strings with backslashes

<?php

$str = "Is your name O ' Reilly?";

echo addslashes ($STR);

?>

stripslashes- dereference A reference string

<?php

$str = "Is your name o\ ' Reilly?";

output : Is your name O ' Reilly?

echo stripslashes ($STR);

?>

substr- Returns a substring of a string

nl2br-inserting HTML wrap tags before all new lines in the string

htmlspecialchars- prohibit script execution (anti-virus)

strcasecmp- binary Security comparison string ( case insensitive)

strcmp- Binary Security string comparison

strncmp- binary Security compare several characters at the beginning of a string

strnatcmp- comparing strings using natural sorting algorithms

substr_replace- a substring of a replacement string

<?php

$input = Array (' a:xxx ', ' b:xxx ', ' c:xxx ');

A simple Case:replace XXX in each string with YYY.

echo Implode ('; ', Substr_replace ($input, ' YYY ', 3, 3)). "\ n";

A more complicated case where each replacement is different.

$replace = Array (' AAA ', ' BBB ', ' CCC ');

echo Implode ('; ', Substr_replace ($input, $replace, 3, 3)). "\ n";

Replace a different number of characters each time.

$length = Array (1, 2, 3);

echo Implode ('; ', Substr_replace ($input, $replace, 3, $length)). "\ n";

?>

strrev- Inverse String

md5-computes the MD5 hash value of a string (cannot be solved after encryption!!) ）

<?php

$str = ' Apple ';

if (MD5 ($str) = = = ' 1f3870be274f6c49b3e31a0c6728957f ') {

echo "Would a green or red apple?";

}

?>

mb_strlen- Gets the length of the string (processing Chinese)

mb_substr- getting the part of a string (processing Chinese) "function: String intercept"

Array (): declaring an array

Foreach: iterating through an array

<?php

$arr = Array (1, 2, 3, 4);

foreach ($arr as & $value) {

$value = $value * 2;

}

$arr is now Array (2, 4, 6, 8)

Unset ($value); Finally, remove the reference

?>

$_post:(displaying large amounts of data in a Web page)

<form action= "" method= "POST" >

User name:<input type= "text" name= "MyText" >

Password:<input type= "password" name= "MyPwd" >

<input type= "Submit" value= " submission " >

</form>

Explode (): string convert to array

<?php

$str = " Zhang San , John Doe , Harry , Zhao Liu ";

$arr =explode ('. ', $str);

Print_r ($arr);

?>

Implode (): array converted to string

<?php

$str = " Zhang San ", " John Doe ", " Harry ", " Zhao Liu ";

$arr =implode ('-', $str);

Print_r ($arr);

?>

Array_search (): query

<?php

$array = Array (0 = ' Blue ', 1 = ' red ', 2 = ' green ', 3 = ' red ');

$key = Array_search (' green ', $array); $key = 2;

$key = Array_search (' red ', $array); $key = 1;

?>

Array_pop (): pops the last cell of the array (out of the stack)

<?php

$stack = Array ("Orange", "banana", "apple", "raspberry");

$fruit = Array_pop ($stack);

Print_r ($stack);

?>

Array_push (): presses one or more cells into the end of the array (into the stack)

<?php

$stack = Array ("Orange", "banana");

Array_push ($stack, "apple", "raspberry");

Print_r ($stack);

?>

Array_unipue (): Remove Duplicate values

Array_combine (): creates an array with the value of an array as its key name, and the value of another array as its value

Array_slice (): remove a paragraph from the array

Array_merge (): merging one or more arrays

9

HTTP://127.0.0.1/phpmyadmin/root Root

Connection Database:mysql_connect (' localhost ', ' root ', ' root ') _ address, account number, password

Select database:mysql_select_db or Die ("database switchover failed")

set encoding format:mysql_query(' Set names UTF8 ');

execute SQL statement:$ret =mysql_query ($sql)

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Summary of PHP functions