Finding PHP Programs Inverting String Detailed Comments!

Hello landlord.

It's a bit winding with recursion, but you can actually use a loop to reverse the string.

function strr($str)

count = strlen($str);

for ($i = $count-1; $i >= 0; $i--)

echo substr($str, $i, 1);

strr("qingming");

If you have to use recursive calling, let me help you analyze it briefly.

function upand($str){

if(strlen($str)>0)

upand(substr($str,1));

echo substr($str,0,1);

return;

upand(lixinghua);

, the first call to upand("lixinghua"), because strlen($str)>0 performed recursion again with upland("ixinghua"), and the echo below has no output yet. 、

The second call to upand("ixinghua"strlen($str) is still greater than 0, so recursively upland("xinghua"),。

The nth call to upand("a"), and repeat until strlen($str)=0, i.e. upand(""), start to execute the echo statement, because all the previous upand echo was not executed, so it was executed one level at a time. . .

So output from the last bit. In this case, the reverse execution is done: upand("a"),upand("ua"),upand("hua")..** that is not completed.

if(strlen($str)>0) executes the following function only if the character length is greater than 0.

upand(substr($str,1));

echo substr($str,0,1);

return;

This is a recursive function. Not tested. But see upand(lixinghua); It should be upand("lixinghua");

For more information on the use of the function substr, please see.

Your s is not an array, s[i] what's the situation at this time, are you sure your program can run?

The assignment of arrays is not a simple sentence ** that can be assigned to s=;

int t = 0;The value of t is 0

string s;

s= ;The value of s is the value of t converted to a string, which is "0".

for (int i = - 1; i >= 0;i--) is 1, and subtracting one is 0, and this cycle is conditional.

static void main(string args)

Method 2: for loop for (int i = 0; i < i++)ps

I've been looking for a long time.,The console hasn't been used for a long time.,**Personal feeling on it is similar to your**The function you want to achieve。

Hope it helps.

int t = 0;Assign a value to the integer t. But it's equal to 0 and has no use value, right? If it's equal to 1234, then you can see the result.

string s;define the string variable ss=; Convert t to a string and assign a value to s. If t=1234, then s="1234"

for (int i = - 1; i >= 0;i--) Hold the console window and wait for keyboard input.

If you're sure that this ** is working, then s=; According to normal logic, it should be to convert characters into arrays.,But I really don't understand your t variable.,How do I look at this**The more wrong it is?,Is it necessary to be so entangled?,There's a way to output the string in reverse order!

Recycle to for strlen

Then the string takes the value of $str, $str

No idea about recursion, recursion back who said.

If you just want to put the characters in a string backwards, you can use the strrev() function.

This should be the initial file for "some" framework! (dot plot enlarged).

It's not enough to look at the manual for each function.

There's nothing to explain about this.

The first function, example, inverts the string.

The second function, num, returns the value of the nth Fibonacci amount.

<% if(goods >0){% to determine whether the goods list has a value.

for(i=0;i-loop array goods list<%=goods list[i].goods_id;%> outputs the value of goods id with the subscript i (0 for the first time, cumulative for the subsequent period), multidimensional arrays, e.g. goods[0] when i is 0]['goods_id'] value.

The output is the same for the rest of the world.

if (goods_list[i].is_virtual == '1'{Determine if the value of is virtual is 1.}