In PHP, all vars are local to current context, unless decl. as 'global' inside
that context.
Can use globals in functions AND set them there: like static vars.
global ${$varname};  $currentval = ${$varname};
OR $currentval = $GLOBALS[$varname]);

Doesn't seem to matter if a func def. is after the first call to it.

Must use POST if big strings in data, else PHP seems to block them.

// SHOW EVERYTHING of what php server has/knows
//foreach ($GLOBALS as $key => $val) { echo "$key => $val <BR>"; };
//phpinfo();


UNIX CALLOUTS
**Simple
system(' ./wtable  < calendar.tab  2>&1');  also works

**Solutions
$cmd =  "wtable < $tab;";
system('(export PATH=.:/home/steve/bin:$PATH ;' .     $cmd     . ') 2>&1'); 


**Callouts:
exec('ls', &$mylist);
foreach ($mylist as $f) { echo "$f<BR>\n"; };

Can set PATH to have my programs work.
$cmd =  "wtable < $tab;";
system('(export PATH=.:~steve/bin:/home/steve/bin:$PATH ;' .     $cmd     . ')
2>&1');
        // ~steve doesn't seem to work now. But full path name does, or link
	prog into local dir. where xx.php is.


system: <?php system('ls  2>&1') // echos it all out to webpage (LFs as sps)
	?> <BR>
echo exec: <?php echo exec('ls') // nothing without echo; then last line only
	// use system('./script'); to call a local script: . not on path
	?> <BR>
<!-- pass_thru: <x?php pass_thru('ls') // doesn't seem to work  ?>
-->
exec('ls -lt', &array):fills array, one line per entry.
shell_exec(cmd) returns output as a string.

system : <?php system('../../bin/sun4/cm steve | wc   2>&1 ') ?> <BR>

system('csh -c "chdir redir; perl uextract < History.html >> out" 2&1');

PROBLEMS
0)	The biggest problem is poor error messages e.g.saying "cmd not found"
when really it's forbidding the exec of binaries not in original 2 bins.

1) Won't run binaries in local dir: says "no such file", even though it's there.
	It isn't because it's the wrong processor binary.

2) Seem to have to refer to local scripts as ./file. (or redir/file is OK)
	./script will work but script will not.
	Fix:  system('export PATH=.:$PATH ;    q;    2>&1');  Works!

3) Will run local scripts.
	And the #! /bin/csh -f  works, even in sh;  BUT the path given has to
	work on the server m/c, not just mine/Lion.

4) Will follow symlinks BUT the target may not be there on the PHP server system

5) Any writing to files MUST have the files with W permission in advance for
everyone.  /tmp OK.


DE-REFFING / INDIRECTION
echo $$name will output the value of the variable whose name is in $name.
echo ${'url' . 3} will output valof $url3. ===  $name = 'url' . 3; echo $$name;
$s = 'echo  $url' . 3 .';';    eval($s);

I.E. you can do double de-reffing with $$;
The braces make it work even if tricky syntax/calc inline on the name,
	and no 2nd $ in that case.
Could also use eval() if you prefer to construct a whole statement as a string
	not just one varname.

EVAL
eval() executes a bit of code given as a string arg.
Includes decls ('global ...'); output ('echo ... ').
Must have semicolon at end of the statement-string.

ARRAYS
$ctable[$table[count($table)-1][0]] = 'witch2.jpg';
//$ctable[$table[end(array_keys($table))][0]] = 'witch2.jpg';
$arr1 = $arr0;  makes a copy;

Not so easy to get last elem of array. end() sets ptr; pop*() removes not
copies last elem, ....

if (!is_array($ctable[$ckey])) { $ctable[$ckey] = array(); }

ANCHORS
Since anchors (#tag part of URL) are only needed in the browser, they may not
be sent to server?
However PHP par parse_url($url) will return it in ['fragment'] if it's there.

There is a workaround if you have to get the anchor to PHP server from browser:
Use javascript in page returned to client;
Have javascript set a cookie with the anchor in, from document.location which
	is URL with anchor in.
Re-fresh page so cookie is sent to server.
[in plain html...]
<script> var x  = location.href.split('#');
<?php if (!$_COOKIE['varname']) : ?>
window.location.reload();
<?php endif; ?>
</script>
[ and from here on, can access the anchor in php from the cookie var]

FOCUS ON TEXT FIELD ONlOAD()
The std. thing in many of my pages is to have the text box already with the
pointer: focus, highlighted, selected.  That's good.

But if the page is also (sometimes) called with an #anchor, then instead of
scrolling to the textbox, it should allow the browser to scroll to the anchor.

So:  should use this as std. in my pages, to get initial select/focus
  function sf(){var x  = location.href.split('#'); if (x && x.length>1) return;
  document.myform.uservalue.focus(); document.myform.uservalue.select();} 
<..  onLoad="sf()" ..>

NB1: call it not sf() but ReadyToType() or SetFocus() ?
NB2: do I still need both focus() and select() ?
NB3: referring to the right box isn't automated. 
	Am using document.form-name.ipbox-name
	Form names seem to be directly in document regardless of DOM nesting.
		<check this>
	FORMs can't be nested
	Elements seem to be directly in FORM regardless of nesting.?
33:	Could set an ID and do getElementById()
	Could get all <INPUT tags by tagtype and check? name
		document.getElementsByTagName('INPUT')
		if ptr.name = 'myname' ....

DATE AND TIME
echo date('l j M Y.', filemtime("$x"));
date() formats a time;  if no 2nd arg, uses current time
$thisyear = date('Y'); // e.g. '2013'
$thismonth = date('n'); // e.g. '9' for Sept.

REG-EXPs in PHP
http://php.net/manual/en/reference.pcre.pattern.syntax.php
For slim/greedy, and lookahead/behind see above URL or my file:
	~/perlsrc/slimREs

pat{2,4}  Match 2 or 3 or 4 times
Back refs within a pattern:  \1 to refer to $1 = the first () subpattern