Add string functions from sscanf to wordwrap

This should conclude all string functions from https://www.php.net/manual/en/book.strings.php

Continuation of vimeo#4576

Ref vimeo#3636

stubs/CoreGenericFunctions.phpstub

@@ -484,6 +484,27 @@ function strtolower(string $str) : string {}
  */
 function strtoupper(string $str) : string {}
 
+/**
+ * @psalm-pure
+ *
+ * @psalm-flow ($str, $to) -> return
+ */
+function strtr(string $str, string $from, string $to) : string {}
+
+/**
+ * @psalm-pure
+ *
+ * @psalm-flow ($str, $replace_pairs) -> return
+ */
+function strtr(string $str, array $replace_pairs) : string {}
+
+/**
+ * @psalm-pure
+ *
+ * @psalm-flow ($string, $replacement) -> return
+ */
+function substr_replace(mixed $string, mixed $replacement, mixed $start, ?mixed $length) : mixed
+
 /**
  * @psalm-pure
  *
@@ -610,6 +631,20 @@ function array_product(array $input) {}
  */
 function strip_tags(string $str, ?string $allowable_tags = null) : string {}
 
+/**
+ * @psalm-pure
+ *
+ * @psalm-flow ($str) -> return
+ */
+function stripcslashes(string $str) : string {}
+
+/**
+ * @psalm-pure
+ *
+ * @psalm-flow ($str) -> return
+ */
+function stripslashes(string $str) : string {}
+
 /**
  * @psalm-pure
  *
@@ -661,6 +696,103 @@ function htmlspecialchars_decode(string $string, ?int $quote_style = null) : str
  */
 function str_replace($search, $replace, $subject, &$count = null) {}
 
+/**
+ * @psalm-pure
+ *
+ * @param string|array<string|int|float> $search
+ * @param string|array<string|int|float> $replace
+ * @param string|array<string|int|float> $subject
+ * @param int $count
+ * @return ($subject is array ? array<string> : string)
+ *
+ * @psalm-flow ($replace, $subject) -> return
+ */
+function str_ireplace($search, $replace, $subject, &$count = null) {}
+
+/**
+ * @psalm-pure
+ *
+ * @psalm-flow ($input, $pad_string) -> return
+ */
+function str_pad(string $input, int $pad_length, $pad_string = '', int $pad_type = STR_PAD_RIGHT): string {}
+
+/**
+ * @psalm-pure
+ *
+ * @psalm-flow ($input) -> return
+ */
+function str_repeat(string $input, int $multiplier): string {}
+
+/**
+ * @psalm-pure
+ *
+ * @psalm-flow ($str) -> return
+ */
+function str_rot13(string $str): string {}
+
+/**
+ * @psalm-pure
+ *
+ * @psalm-flow ($str) -> return
+ */
+function str_shuffle(string $str): string {}
+
+/**
+ * @psalm-pure
+ *
+ * @psalm-flow ($string) -> return
+ */
+function str_split(string $string, int $split_length = 1): array {}
+
+/**
+ * @psalm-pure
+ *
+ * @psalm-flow ($haystack, $needle) -> return
+ */
+function strstr(string $haystack, mixed $needle, bool $before_needle = false): array {}
+
+/**
+ * @psalm-pure
+ *
+ * @psalm-flow ($haystack) -> return
+ */
+function stristr(string $haystack, mixed $needle, bool $before_needle = false): array {}
+
+/**
+ * @psalm-pure
+ *
+ * @psalm-flow ($haystack) -> return
+ */
+function strchr(string $haystack, mixed $needle, bool $before_needle = false): array {}
+
+/**
+ * @psalm-pure
+ *
+ * @psalm-flow ($haystack) -> return
+ */
+function strpbrk(string $haystack, string $char_list): string {}
+
+/**
+ * @psalm-pure
+ *
+ * @psalm-flow ($haystack) -> return
+ */
+function strrchr(string $haystack, mixed $needle): string {}
+
+/**
+ * @psalm-pure
+ *
+ * @psalm-flow ($string) -> return
+ */
+function strrev(string $string): string {}
+
+/**
+ * @psalm-pure
+ *
+ * @psalm-flow ($string) -> return
+ */
+function strtok(string $str, string $token): string {}
+
 /**
  * @psalm-pure
  *
@@ -748,6 +880,22 @@ function preg_quote(string $str, ?string $delimiter = null) : string {}
  */
 function sprintf(string $format, ...$args) : string {}
 
+/**
+ * @psalm-pure
+ * @return string|false
+ * 
+ * @psalm-flow ($format, $args) -> return
+ */
+function vsprintf(string $format, array $args) {}
+
+/**
+ * @psalm-pure
+ * @return string
+ * 
+ * @psalm-flow ($str) -> return
+ */
+function wordwrap(string $str, int $width = 75, string $break = "\n", bool $cut = false) : string {}
+
 /**
  * @psalm-pure
  *
@@ -789,6 +937,8 @@ function strval ($var): string {}
 /**
  * @return ($input is non-empty-string ? non-empty-list<string> : non-empty-list<string>|array{null})
  * @psalm-pure
+ *
+ * @psalm-flow ($input) -> return
  */
 function str_getcsv(string $input, string $delimiter = ',', string $enclosure = '"', string $escape = '\\\\')
 {