Php matches multiple results with regular expressions and replaces one result randomly.

Match multiple results with regular expressions in php and replace one result randomly. Use regular expressions to match characters. if you replace all the characters, you can use preg_replace. However, I want to randomly replace one of the multiple matched results, which uses regular expression matching characters. if it is easy to replace all, use preg_replace. But now I want to randomly replace one of the multiple matched results, which is a little troublesome. I wrote a function to solve the problem. I don't know if there are any other better methods. Example: "I have a dream. I have a dream." matches '/I /'. The above string contains four matching results. I only need to randomly replace one of them. Replace I with hell.

My code is as follows:

[Php]

// Regular expression processing function

Function rand_replace_callback ($ matches ){

Global $ g_rand_replace_num, $ g_rand_replace_index, $ g_rand_replace_str;

$ G_rand_replace_index ++;

If ($ g_rand_replace_num = $ g_rand_replace_index ){

Return $ g_rand_replace_str;

} Else {

Return $ matches [0];

}

}

// If the random regular expression replacement function has multiple matching units, replace one of them randomly.

// Note global $ g_rand_replace_num, $ g_rand_replace_index, $ g_rand_replace_str; do not conflict with other global variables.

// A regular expression processing function is used to record the total number of matching units, take a random value within the range of the total number, and process the result when the regular expression processing function determines that the number is equal.

Function rand_preg_replace ($ pattern, $ t_g_rand_replace_str, $ string)

{

Global $ g_rand_replace_num, $ g_rand_replace_index, $ g_rand_replace_str;

Preg_match_all ($ pattern, $ string, $ out); $ find_count = count ($ out [0]); // The total number of matched units

$ G_rand_replace_num = mt_rand (1, $ find_count); // A set that meets regular search criteria

$ G_rand_replace_index = 0; // index during actual replacement

$ G_rand_replace_str = $ t_g_rand_replace_str;

Echo "now {$ find_count} matching items are found
";

$ Ss = preg_replace_callback ($ pattern, "rand_replace_callback", $ string );

Return $ ss; www.2cto.com

}

$ String = "I have a dream. I have a dream .";

Echo rand_preg_replace ('/I/', "hell", $ string );

What should I do if I want to reduce the concept of replacing the first result? In some cases, the first replacement is not very good, but a small number of results are required to replace the first one.

Bytes. However, I want to randomly replace one of the multiple matched results...