variables(5) - phpMan

__after_morecore_hook (3) - malloc debugging variables
__free_hook (3)      - malloc debugging variables
__malloc_hook (3)    - malloc debugging variables
__malloc_initialize_hook (3) - malloc debugging variables
__memalign_hook (3)  - malloc debugging variables
__realloc_hook (3)   - malloc debugging variables
atan2 (3)            - arc tangent function of two variables
atan2f (3)           - arc tangent function of two variables
atan2l (3)           - arc tangent function of two variables
B::Showlex (3pm)     - Show lexical variables used in functions or files
confstr (3)          - get configuration dependent string variables
confstr (3p)         - get configurable variables
English (3pm)        - use nice English (or awk) names for ugly punctuation v...
environment (5)      - the environment variables config files
envsubst (1)         - substitutes environment variables in shell format strings
export (1p)          - set the export attribute for variables
fpathconf (3p)       - get configurable pathname variables
ldap.conf (5)        - LDAP configuration file/environment variables
malloc_hook (3)      - malloc debugging variables
ntptime (8)          - read and set kernel time variables
pam_env (8)          - PAM module to set/unset environment variables
pam_env.conf (5)     - the environment variables config files
pathconf (3p)        - get configurable pathname variables
perlvar (1)          - Perl predefined variables
pthread_cond_destroy (3p) - destroy and initialize condition variables
pthread_cond_init (3p) - destroy and initialize condition variables
readonly (1p)        - set the readonly attribute for variables
sysconf (3p)         - get configurable system variables
tickadj (8)          - set time-related kernel variables
unset (1p)           - unset values and attributes of variables and functions