PHP教程之PHP中文函数连载(二)

我假设你目前已经可以完成一个静态页面了，当然，做的好看难看是另外一说，皮皮我的第一个网页也没好看到哪去，但是“孩子”再丑，咱们做“爹妈”的也不能嫌弃不是?这毕竟是咱的成果。函数|中文   函数count()
描写：
盘算一变量中元素的个数
int count (mixed var);
Returns the number of elements in var , which is typically an array (since anything else will have one element).
Returns 0 if the variable is not set.
Returns 1 if the variable is not an array.

函数current()
描写：
传回数组指针今朝所指的元素

mixed current (array array);

Each array variable has an internal pointer that points to one of its elements. In addition, all of the elements in the array are linked by a bidirectional linked list for traversing purposes. The internal pointer points to the first element that was inserted to the array until you run one of the functions that modify that pointer on that array.

The current()</B> function simply returns the array element that's currently being pointed by the internal pointer. It does not move the pointer in any way. If the internal pointer points beyond the end of the elements list, current()</B> returns false.

函数each()
描写：
前往数组中下一对key/value的值

array each (array array);

Returns the current key/value pair from the array array and advances the array cursor. This pair is returned in a four-element array, with the keys 0 , 1 , key , and value . Elements 0 and key each contain the key name of the array element, and 1 and value contain the data.

Example 1. each()</B> examples

＄foo = array( "bob", "fred", "jussi", "jouni" ); ＄bar = each( ＄foo );
＄bar now contains the following key/value pairs:

0 => 0
1 => 'bob'
key => 0
value => 'bob'

＄foo = array( "Robert" => "Bob", "Seppo" => "Sepi" ); ＄bar = each( ＄foo );

＄bar now contains the following key/value pairs:

0 => 'Robert'
1 => 'Bob'
key => 'Robert'
value => 'Bob'

Example 2. Traversing ＄HTTP_POST_VARS with each()</B>

echo "Values submitted via POST method:<br>";
while ( list( ＄key, ＄val ) = each( ＄HTTP_POST_VARS ) ) {
echo "＄key => ＄val<br>";
}

函数end()
描写：
将数组中的指针移到最初一个
end (array array);
end()</B> advances array 's internal pointer to the last element.

函数key()
描写：
从一数组中掏出key
mixed key (array array);
key()</B> returns the index element of the current array position.

函数ksort()
描写：
以key来分列一数组
Example 1. ksort()</B> example

＄fruits = array("d"=>"lemon","a"=>"orange","b"=>"banana","c"=>"apple");
ksort(＄fruits);
for(reset(＄fruits);
＄key = key(＄fruits);
next(＄fruits)) { echo "fruits[＄key] = ".＄fruits[＄key]."\n"; }

This example would display: fruits[a] = orange fruits = banana fruits[c] = apple fruits[d] = lemon

函数list()
描写：
用相似数组的体例去指定一整串变量的值
Example 1. list()</B> example

<table> <tr> <th> Employee name</th>
<th>Salary</th> </tr>
<?php ＄result = mysql(＄conn, "SELECT id, name, salary FROM employees");
while (list(＄id, ＄name, ＄salary) = mysql_fetch_row(＄result)) {
print(" <tr>\n"."<td><a href=\"info.php3?id=＄id\">＄name</a></td>\n"."<td>＄salary</td>\n"." </tr>\n");
}
?>
</table>

函数next()
描写：
将数组的指向指到下一组数据


函数pos()
描写：
传回数组确当前的数据

函数prev()
描写：
传回数组的前一条的数据

函数reset()
描写：
数组的指针指到第一条

函数rsort ()
描写：
以倒序体例分列一个数组
Example 1. rsort()</B> example

＄fruits = array("lemon","orange","banana","apple");
rsort(＄fruits);
for(reset(＄fruits); (＄key,＄value) = each(＄fruits); ) {
echo "fruits[＄key] = ".＄value."\n";
}

This example would display: fruits[0] = orange fruits[1] = lemon fruits[2] = banana fruits[3] = apple The fruits have been sorted in reverse alphabetical order.

函数sizeof()
描写：
获得一个数组的巨细和元素的数量

函数sort()
描写：
排序数组
Example 1. sort()</B> example

＄fruits = array("lemon","orange","banana","apple");
sort(＄fruits);
for(reset(＄fruits);
＄key = key(＄fruits);
next(＄fruits)) {
echo "fruits[＄key] = ".＄fruits[＄key]."\n";
}

This example would display: fruits[0] = apple fruits[1] = banana fruits[2] = lemon fruits[3] = orange The fruits have been sorted in alphabetical order.

函数uasort()
描写：
以自界说的体例分列一个数组且序列不变。


函数uksort()
描写：
以自界说的体例以key分列
This function will sort the keys of an array using a user-supplied comparison function. If the array you wish to sort needs to be sorted by some non-trivial criteria, you should use this function. Example 1. uksort()</B> example

function mycompare(＄a, ＄b) {
if (＄a == ＄b) return 0;
return (＄a > ＄b) ? -1 : 1;
}
＄a = array(4 => "four", 3 => "three", 20 => "twenty", 10 => "ten");
uksort(＄a, mycompare);
while(list(＄key, ＄value) = each(＄a)) {
echo "＄key: ＄value\n";
}


This example would display: 20: twenty 10: ten 4: four 3: three

函数usort()
描写：
以自界说的体例以value分列

void usort (array array, function cmp_function);

This function will sort an array by its values using a user-supplied comparison function. If the array you wish to sort needs to be sorted by some non-trivial criteria, you should use this function. Example 1. usort()</B> example

function cmp(＄a,＄b) {
if (＄a == ＄b) return 0;
return (＄a > ＄b) ? -1 : 1;
}
＄a = array(3,2,5,6,1);
usort(＄a, cmp);
while(list(＄key,＄value) = each(＄a)) {
echo "＄key: ＄value\n";
}


This example would display: 0: 6 1: 5 2: 3 3: 2 4: 1 Obviously in this trivial case the rsort()</B> function would be more appropriate.
BC (Arbitrary Precision) Functions


函数bcadd()
描写：
Add two arbitrary precision numbers
string bcadd (string left operand, string right operand, int [ scale ]); 左面的字符加左面的字符，前往一个字符。


函数bccomp()
描写：
int bccomp (string left operand, string right operand, int [ scale ]);
左面的字符和左面的字符停止对照，假如相等的话前往0，假如左面的比左面的长前往+1，左面的比左面的长前往-1


函数bcdiv()
描写：
Divide two arbitrary precision numbers
string bcdiv (string left operand, string right operand, int [ scale ]); 将左面的字符串以左面的字符串为尺度分隔


函数bcmod()
描写：
Get modulus of an arbitrary precision number
string bcmod (string left operand, string modulus);
用左面的modulus操作左面的字符串


函数bcmul()
描写：
Multiply two arbitrary precision number
string bcmul (string left operand, string right operand, int [ scale ]);
Multiply the left operand by the right operand and returns the result. The optional scale sets the number of digits
after the decimal place in the result.


函数bcpow()
描写：
Raise an arbitrary precision number to another.
Raise x to the power y . The scale can be used to set the number of digits after the decimal place in the result.


函数bcscale()
描写：
Set default scale parameter for all bc math functions.
string bcscale (int scale);
This function sets the default scale parameter for all subsequent bc math functions that do not explicitly specify a scale
parameter


函数bcsqrt()
描写；
string bcsqrt (string operand, int scale);
前往字符的平方根


函数bcsub()
描写：
string bcsub (string left operand, string right operand, int [ scale ]);
将左面的字符减去左面的字符


Calendar Functions日历功效


函数JDToGregorian()
描写：
string jdtogregorian (int julianday);
将Julian日历转换成Gregorian日历


函数GregorianToJD()
描写：
int gregoriantojd (int month, int day, int year);
将Gregorian日历转换成Julian日历


函数JDToJulian ()
描写：
string jdtojulian (int julianday);
将Julian Calendar转换Julian Day


函数JulianToJD ()
描写：
int juliantojd (int month, int day, int year);


函数JDToJewish ()
描写：
Converts a Julian Day Count to the Jewish Calendar
string jdtojewish (int julianday);


函数JewishToJD()
描写：
Converts a date in the Jewish Calendar to Julian Day Count
int jewishtojd (int month, int day, int year);


函数JDToFrench()
描写：
Converts a Julian Day Count to the French Republican Calendar
string jdtofrench (int month, int day, int year);


函数FrenchToJD()
描写：
Converts a date from the French Republican Calendar to a Julian Day Count int frenchtojd (int month, int day, int year);


函数JDMonthName ()
描写：
Returns a month name
string jdmonthname (int julianday, int mode);
Mode Meaning
0 Gregorian - apreviated
1 Gregorian
2 Julian - apreviated
3 Julian
4 Jewish
5 French Republican


函数JDDayOfWeek ()
描写：
Returns the day of the week
mixed jddayofweek (int julianday, int mode);
Mode Meaning
0 returns the day number as an int (0=sunday, 1=monday, etc)
1 returns string containing the day of week (english-gregorian)
2 returns a string containing the abreviated day of week (english-gregorian)
不过还好，PHP语言给出的语法错误很详细，只要稍微熟悉一点之后，看错误提示就能很容易找出错误所在的。PHP还有一个特别好用的调试功能，在PHP语句中，你可以随时用echo来输出结果。

首先我是坚决反对新手上来就用框架的，因为对底层的东西一点都不了解，造成知识上的真空，会对以后的发展不利。我的观点上手了解下框架就好，代码还是手写。当然啦如果是位别的编程语言的高手的话，这个就另当别论啦。