[redhead]

Then something like this might be usefull:

#include <stdio.h>

int main(int argc, char** argv)
{
  FILE *ifp, *ofp;
  int hold_eol = 0;
  char ch;
  if(argc != 3){
    printf("Usage: %s <infile> <outfile>\n", argv[0]);
    return -1;
  }
  if(!(ifp=fopen(argv[1], "r"))){
    printf("Error opening file %s for reading\n", argv[1]);
    return -1;
  }
  if(!(ofp=fopen(argv[2], "w"))){
    printf("Error opening file %s for writing\n", argv[2]);
    return -1;
  }
  while(EOF!=(ch=fgetc(ifp))){
    if(ch == '\"')
      if(hold_eol)
	hold_eol = 0; /* we exit a quote container */
      else
	hold_eol = 1; /* we enter a quote container */
    if(ch == '\n' && hold_eol)
      ch=' '; /* replace eol with space */
    fprintf(ofp, "%c", ch); /* print current char to file */
  }
  fclose(ifp);
  fclose(ofp);
  return 0;
}

I think it is quite easy to transform into some PHP code... Since PHP syntax is very much like C/C++ and the PHP API provides almost identical library functions.