You may know the classic demonstration about the different behaviour of constructors in PHP 3 and PHP 4 in the manual. Here it is as a small reminder:
| Quote: |
class A {
function A() {
echo "I am the constructor of A.<br>\n";
}
function B() {
echo "I am a regular function named B in class A.<br>\n";
echo "I am not a constructor in A.<br>\n";
}
}
class B extends A {
function C() {
echo "I am a regular function.<br>\n";
}
}
$b = new B;
|
PHP 4 regards a function as constructor if it has been defined as such in the class it's residing. Class B hasn't got a constructor, however it's extended by A which means it inherits the constructor (though it's called "A" and not "B") and we see I am the constructor of A
as output.
So far so good. However it seems that PHP 4.3.4 restored the behaviour of PHP 3 which only regards a function a constructor if it's of the same name as the class which has been called. So instead, I'm confronted with I am a regular function named B in class A.
I am not a constructor in A.
which is quite irritating.
The reason I'm telling this is I wrote some classes which relied on the PHP 4 behaviour, however because of the change it failed to work. Tracking down the error I came to that surprising result.
Platform: Linux 2.4.22, PHP 4.3.4 as Apache module, Apache 2.0.48.
Some PHP settings:
allow_call_time_pass_reference Off
allow_url_fopen On
always_populate_raw_post_data Off
arg_separator.input &
arg_separator.output &
asp_tags Off
auto_append_file no value
auto_prepend_file no value
browscap no value
default_charset no value
default_mimetype text/html
define_syslog_variables Off
disable_classes no value
disable_functions no value
display_errors On
display_startup_errors Off
doc_root no value
docref_ext .html
docref_root /php-manual/
enable_dl On
error_append_string no value
error_log no value
error_prepend_string no value
error_reporting 2047
expose_php On
extension_dir /usr/lib/php4
file_uploads On
gpc_order GPC
highlight.bg #FFFFFF
highlight.comment #FF8000
highlight.default #0000BB
highlight.html #000000
highlight.keyword #007700
highlight.string #DD0000
html_errors On
ignore_repeated_errors Off
ignore_repeated_source Off
ignore_user_abort Off
implicit_flush Off
include_path .:/usr/include/php
log_errors Off
log_errors_max_len 1024
magic_quotes_gpc Off
magic_quotes_runtime Off
magic_quotes_sybase Off
max_execution_time 15
max_input_time 15
memory_limit 16M
open_basedir /home/httpd/
output_buffering no value
output_handler no value
post_max_size 8M
precision 14
register_argc_argv Off
register_globals Off
report_memleaks On
safe_mode On
safe_mode_exec_dir no value
safe_mode_gid Off
safe_mode_include_dir no value
sendmail_from me(at)localhost(dot)com
sendmail_path /usr/sbin/sendmail -t -i
serialize_precision 100
short_open_tag Off
SMTP localhost
smtp_port 25
sql.safe_mode Off
track_errors Off
unserialize_callback_func no value
upload_max_filesize 2M
upload_tmp_dir /home/httpd/phptemp
user_dir no value
variables_order EGPCS
xmlrpc_error_number 0
xmlrpc_errors Off
y2k_compliance On
Just in case it has something to do with my configuration. Is there a way to restore the former PHP 4 behaviour?
Olliver
[Updated on: Tue, 18 November 2003 14:52]
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